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SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B 3/04; goggles or eyeshields not having the same features as spectacles A61F 9/00)
Definition statement
This subclass/group covers:

Ophthalmic devices intended to be worn or supported by the user, either in front of the eyes or placed in contact with the eyes: spectacles (eyeglasses), contact lenses, sunglasses, goggles insofar as they have the same features as spectacles.

Optical parts of eyewear and methods of their design, e.g. lenses, filters, polarizers, mirrors, prisms, obturators, shields, auxiliary lenses.

Mechanical parts of eyewear (Means to support the optical parts) e.g. spectacle frames, bridges, nose pads, side-members.

Means to attach auxiliary optical parts to eyewear.

Means for supporting eyewear e.g. retainers, headbands.

Non-optical adjuncts to eyewear, e.g. ornaments, illumination, hearing aids and other electronic means, anti-misting means.

Assembling, repairing and cleaning of spectacles and contact lenses.

Measuring geometrical parameters for fitting or during assembling spectacles.

Relationship between large subject matter areas

This subclass concerns only extracorporal ophthalmic devices. Owing to their medical nature, implanted devices such as intraocular lenses and corneal implants are classified in A61F 2/00, as well as ophthalmologic instruments in A61B 3/00(diagnostic) and A61F 9/00(therapeutic).

This subclass covers spectacles or goggles insofar they have features of vision correction or protection. Sunglasses are covered by this subclass insofar they protect the eye against high levels of visible and ultraviolet light. Groups A61F 9/02 and A61F 9/04 cover goggles or eye-masks (eye-shields) as forms of protective eyewear worn to prevent particulates or chemicals from striking the eyes, and not having the features of vision correction or protection against high levels of visible and ultraviolet light, which are normally associated to spectacles. Typical examples of goggles covered by these groups are goggles worn while welding, drilling or sawing. Goggles for swimming are covered by A63B 33/00, whereas diving masks are covered by B63C 11/12.

References relevant to classification in this subclass
This subclass/group does not cover:
Trial frames and lenses for testing the eyes
Lenses implantable into the eye
Optical elements characterized by their material
Spectacles for watching 3D
Informative references
Attention is drawn to the following places, which may be of interest for search:
Visors for helmets
Instruments for examining the eye
Lenses implantable into the eye
Instruments for treating the eye
Goggles not having the same features as spectacles
Swimming goggles
Diving masks
Instruments for testing optical devices
Optical systems in general
Simple or compound lenses
Special rules of classification within this subclass

Generally, more than one subgroup should be assigned whenever applicable.

Further detail not provided for in any of the main groups is provided for in the subgroups of G02C 2200/00 representing information orthogonal to one or to more than one of the groups G02C 1/00 to G02C 13/00 and their subgroups

symbols of the type G02C 2200/00 cover mechanical features (frame)

symbols of the type G02C 2202/00 cover optical features (lenses).

Assemblies of lenses with bridges or browbars
Definition statement
This subclass/group covers:

All aspects of mounting the lenses to the frame front:

front portions of the spectacle frames to which the lenses are mounted;

assemblies of lenses with bridges or browbars and other fixing parts

Frame front types: rimless, half-rim, full-rim, split-rim.

Means for mounting: types of grooves, mounting threads, closure means of split frames.

Half lens spectacles.

Frame and lenses integrally formed .

Special rules of classification within this group

Frame front portions enabling easy exchange of lenses: add G02C 2200/08

Bridge or browbar secured to lenses without the use of rims
Definition statement
This subclass/group covers:

Rimless spectacles, e.g. with or without holes, recesses or slits in the lenses.

means for securing: screws, nuts, washers, stems, rods, dowels.

Holes or slits provided in axial direction or in the peripheral surface of the lens (recesses).

{ with lenses secured to the fixing parts by clamping, luting, soldering, gluing without holes or recesses in the lenses (G02C 1/04 to G02C 1/08 take precedence) }
Definition statement
This subclass/group covers:

Rimless spectacles without holes, recesses or slits in the lenses.

References relevant to classification in this subgroup
This subclass/group does not cover:
Bridges and browbars secured or integral with partial rims
Bridge or browbar secured or integral with closed rigid rims
The rims being transversly split and provided with securing means
{with auxiliary bars (G02C 1/04 to G02C 1/08 take precedence) }
Definition statement
This subclass/group covers:

Rimless spectacles with additional bar not directly fixed to the lenses. e.g. second bridge

References relevant to classification in this subgroup
This subclass/group does not cover:
Bridges and browbars secured or integral with partial rims
Bridge or browbar secured or integral with closed rigid rims
The rims being transversly split and provided with securing means
Bridge or browbar secured to or integral with partial rims, e.g. with partially-flexible rim for holding lens
Definition statement
This subclass/group covers:

Front frames having only an upper portion or only a lower portion.

Front frames having two halves of different material, frequently a rigid (upper) portion and a soft (lower) portion, the top portion frequently comprising a groove, the lower portion being constituted by a (nylon) thread.

Bridge or browbar secured to or integral with closed rigid rims for the lenses
Definition statement
This subclass/group covers:

Closed rims (frequently from plastics material) comprising a groove in which the lenses are held.

the rims being tranversely split and provided with securing means
Definition statement
This subclass/group covers:

Rims (frequently made from metal) split (opened) for inserting the lens,

frames split at temporal or nasal side or any other location,

means for closing the split frame portions for securing the lens:

  • Blocks and screw.
  • Split bridge.
  • Combined closing means and front hinge element ("split hinge").
  • Various special closing means.
Special rules of classification within this group

Combined closing means and front hinge element: add G02C 5/22 or subgroup.

{ Special mounting grooves in the rim or on the lens}
Definition statement
This subclass/group covers:

Groove profiles other than V-grooves such as (semi-) circular, rectangular, asymmetric.

Profile varying or being interrupted along the perimeter of the rim.

Special supporting arrangements for lens assemblies or monocles (lenses therefor G02C 7/00; by walking-sticks A45B 3/00)
Definition statement
This subclass/group covers:

Supporting lenses, front frames or spectacles on the head by other means than temples, bridge or nose pads or in addition thereto.

Supporting lenses and spectacles by neck, headgear, garment or other articles (e.g. lorgnons).

Relationship between large subject matter areas

G02C 3/00 and subgroups concern devices for supporting spectacles.

G02C 11/00 and subgroups concern devices supported by spectacles.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Lenses therefor
Lens assemblies or monocles supported by walking-sticks
Special rules of classification within this group

If specially adapted frame portions (e.g. temple ends) are required: add respective sub-group (e.g. G02C 5/143).

{ Arrangements for fitting and securing to the head in the position of use}
Definition statement
This subclass/group covers:

Retainers (straps, cords, chains, bands) for spectacles in front of the eyes:

straps, cords, chains, bands replacing the temples or in addition to temples.

Lenses or spectacle parts fixed to the face by piercings.

Means for preventing spectacles from slipping.

Means for reducing weight or pressure on the nose or on the ears, balancing the weight of the spectacles.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Jewellery holding or retaining articles, e.g. spectacles
Piercing type jewellery
Straps, buckles, attachment of headbands for goggles
{ Arrangements for fitting and securing to the head or neck not in the position of use}
Definition statement
This subclass/group covers:

Retainers for spectacles (straps, cords, chains, bands) to be worn around the neck when the spectacles are not in use.

Special rules of classification within this group

Only if the retainer has a special (support) function when the spectacles are worn in front of the eyes: add G02C 3/003.

Arrangements for supporting by headgear
Definition statement
This subclass/group covers:

Devices for mounting spectacles to hats, caps, sun shields, helmets, etc.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Securing spectacles or goggles on helmet shells
Arrangements for supporting by hand, e.g. lorgnette, Arrangements for supporting by articles (by walking-sticks A45B 3/00)
Definition statement
This subclass/group covers:

Lorgnon, lorgnette.

Holding devices for spectacles e.g. on garment, clothes, in cars, on belts etc.

combination of spectacles and cases.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Support by walking sticks
Spectacle cases
Fastening articles to the garment
Supporting spectacles in vehicles
(Hand held) magnifying glasses
Construction of non-optical parts
Definition statement
This subclass/group covers:

Mechanical parts of spectacles such as bridges, nose pads, hinges, temples.

Frame (parts) made from special materials.

Frames having special properties or functions other than supporting lenses

mounting details.

References relevant to classification in this group
This subclass/group does not cover:
Spectacle frame front portions
Special rules of classification within this group

Modular frames or frames comprising easily exchangeable elements: add G02C 2200/08.

{specially adapted for particular purposes, not otherwise provided for or not fully classifiable according to technical characteristics, e.g. therapeutic glasses}
Definition statement
This subclass/group covers:

Frames having special properties or functions other or in addition to holding lenses.

Spectacle frames lacking conventional parts:

Spectacles having only one or no temple, having no bridge, only one rim.

Unconventional shape or use:

Asymmetric frames, attachment of the temples at the underside of the frame,

temple(s) pivotable to the front side of the frame front, convertible, reversible spectacles (front/back, up/down).

Spectacles for specially shaped faces (e.g. babies, Down-syndrome patients);

Fully individual adaption of the shape of frame portion e.g. by molding etc.

Special construction to protect the lenses when laying down the glasses.

References relevant to classification in this group
This subclass/group does not cover:
Half-lens spectacles and frames therefor
Lorgnons
Pince-nez
Special rules of classification within this group

Add group symbol relating to the feature providing the unconventional function, e.g. G02C 5/12, G02C 5/14, G02C 5/22.

{Shooting or aiming glasses}
Definition statement
This subclass/group covers:

Spectacle frames for shooting glasses.

Glasses for sports requiring aiming, e.g. golf, frequently with means for adjusting the aiming elements (pin holes, cross lines).

Informative references
Attention is drawn to the following places, which may be of interest for search:
Lenses comprising markings
Shields, shades obturators
{Glasses allowing access to one eye, e.g. for make-up application}
Definition statement
This subclass/group covers:

Spectacles comprising individually pivotable (vertically, horizontally) rims.

References relevant to classification in this group
This subclass/group does not cover:
Pivotally arranged auxiliary lenses, clipons
{Collapsible frames}
Definition statement
This subclass/group covers:

Frames having multiple possibilities to be folded (other than just the conventional opening and closing of the temples or in addition thereto).

Informative references
Attention is drawn to the following places, which may be of interest for search:
Hinges in the middle of the temple; or bridge
Special rules of classification within this group

Add subgroup relating to the elements involved in the collapsing action, e.g. G02C 5/22, G02C 5/20, G02C 5/08.

{ Spectacles frames characterized by their material, material structure and material properties}
Definition statement
This subclass/group covers:

Frames made from metal, polymers, horn, wood, shape memory alloy, superelastic materials, etc.

Structure of the material: layered, compound, wire, sheet type material, credit-card shaped spectacles, spectacles made from card board (e.g. polarizing stereo).

Properties of the frame resulting from materials (e.g. floating, particularly soft).

Informative references
Attention is drawn to the following places, which may be of interest for search:
Shape memory alloys, super elastic metals per se
Doublé, galvanic layers, corrosion resistance
Production of spectacle frames from metal (wire)
Special rules of classification within this group

As for the material per se, use this sub-group only if the material is essential to achieve a particular functionality or property (e.g. floating spectacles, super elastic temples) or requires special assembly or treatment techniques (e.g. wood or horn frames).

Add one of G02C 2200/10 to G02C 2200/16 if applicable.

Bridges; Browbars; Intermediate bars (nose engaging-surfaces G02C 5/12)
Definition statement
This subclass/group covers:

Elements joining the two rims or lenses.

Spectacles detachable or detached at the location of the bridge.

Double bridge, reinforced bridge.

Horizontally or vertically split bridge.

Special bridge for mounting nose-pad arms, pads or other nose engaging surfaces.

Bridge specially adapted for mounting decorative elements.

Bridge adapted for holding temples when closed, e.g. with magnetic means.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Nose engaging surfaces
Special rules of classification within this group

Horizontally split bridges: add G02C 1/08.

Special bridge for mounting pad arms, pads etc.: add G02C 5/12 or subgroup.

foldable
Definition statement
This subclass/group covers:

Hinge or other element enabling folding on the bridge.

Intermediate bars or bars between bridge and side-members
Definition statement
This subclass/group covers:

Individual parts between front frame and hinge, not generally present in all kinds of frames.

Nose pads; Nose-engaging surfaces of bridges or rims
Definition statement
This subclass/group covers:

Nose pads, elements for mounting and retaining nose pads.

Bridge type pads, bridge saddle, two individual pads, twinned pads

mounted to the bridge or to the rims.

Pads integral with rims.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Paddings, cushions, fitting to the face for goggles
Protection of the nose
{with adjustable means}
Definition statement
This subclass/group covers:

Adjustable and resilient mounting of nose pads and other nose engaging elements.

{for vertically varying the position of the lenses}
Definition statement
This subclass/group covers:

Can be achieved by vertical or horizontal adjustment of the pads.

{ exchangeable or otherwise fitted to the shape of the nose}
Definition statement
This subclass/group covers:

Exchangeable pads or pads providing particular fit and comfort.

{ Pince-nez}
Definition statement
This subclass/group covers:

Spectacles comprising a front frame only comprising clamping nose pads or other nose clamping functionality.

Special rules of classification within this group

Use this class also in absence of (special) nose pads or pad mounting.

Side-members
Definition statement
This subclass/group covers:

Temples, rigid side members rearwards from the hinge or directly attached to the front frame (no hinge).

Special temples for receiving non optical adjuncts.

Special temples acting as case for the front and the lenses.

Adjustable, reinforced, resilient, shortened temples.

References relevant to classification in this group
This subclass/group does not cover:
Spectacles having only one temple
Side members other than temples, e.g. straps, head bands
Informative references
Attention is drawn to the following places, which may be of interest for search:
Non-optical adjuncts: decorative, hearing aids, illumination, etc.
{ having special ear pieces}
Definition statement
This subclass/group covers:

Special temple ends: individual, wired, securing means.

Temples having no ear piece (shortened temples).

{ having special front end}
Definition statement
This subclass/group covers:

Special temple front ends, e.g. split front ends requiring two hinges,

front end particularly constructed for fixing the hinge or a non-optical adjunct.

resilient or with resilient parts
Definition statement
This subclass/group covers:

Resiliently deformable temple or temple parts.

reinforced
Definition statement
This subclass/group covers:

Temple reinforced, e.g. by a metal core.

adjustable, e.g. telescopic
Definition statement
This subclass/group covers:

Temples having adjustable length, self adjusting length.

Temples having adjustable inclination and/or opening angle.

Foldable temples, temples having a hinge.

Temple rotatable about its longitudinal axis

Special rules of classification within this group

If adjustable inclination and opening angle is enabled by features of the hinge, only use G02C 5/22 or subgroups.

Foldable temples having a hinge: add G02C 5/22 or subgroup.

Hinges (pivotal connection in general F16C 11/00)
Definition statement
This subclass/group covers:

Junctions between elements of the spectacles frame:

(front frame - temple, rim - temple, intermediate portion - temple

bridge - bridge, temple - temple).

Pivotal junctions comprising or not comprising well-defined pivot axis

Elements combining hinge (front portion) and securing means for closing a rim of the front frame (split hinge).

Details of the pivot or bearing.

Special hinge screws.

Elastic hinges comprising coil springs or other springs.

Composite hinges allowing multiple axis rotation.

Hinges having an oblique axis.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Pivotal connection in general
Special rules of classification within this group

Combined closing means and front hinge element ("split hinge"): add G02C 1/08.

{ Pivot bearings and hinge bolts other than screws}
Definition statement
This subclass/group covers:

Hinges comprising means for providing pivotal connections other than screws, screwless hinges.

{Resilient hinges}
Definition statement
This subclass/group covers:

Hinge comprising elastic means urging the temple towards at least one predetermined angular position (opened and/or closed position), frequently following overextension beyond the normal open position of use.

References relevant to classification in this group
This subclass/group does not cover:
Resilient hingeless junctions
Special rules of classification within this group

If applicable add suitable subgroup of G02C 2200/00.

{ comprising a fixed hinge member and a coil spring}
Definition statement
This subclass/group covers:

Both hinge members are fixed with respect to the front frame and the temple; a coil is used for the overextension, the eyelets (or the coil) are fixed to front frame and temple. Illustrative example:

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{ comprising a sliding hinge member and a coil spring}
Definition statement
This subclass/group covers:

At least one hinge member slidingly connected to temple or front frame, coil actuated by piston or housed in a sliding box. Illustrative example:

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{ comprising a sliding box containing a spring}
Definition statement
This subclass/group covers:

Hinge comprising a slidingly arranged box shaped element housing (and actuating) a coil spring.

{ comprising elastic means other than coil spring}
Definition statement
This subclass/group covers:

Resilient part other than a coil spring generating an elastic effect

e.g. leaf spring, rubber, elastic wire.

{Composite hinges, e.g. for varying the inclination of the lenses}
Definition statement
This subclass/group covers:

Hinges allowing multiple axis rotation.

Hinges allowing variation of inclination of the front frame.

Hinges allowing 180° folding of temples.

Hinges allowing temples to be rotated about their longitudinal axis.

Connected hinges cooperating to open both temples using one hand only.

{ Hinges without well-defined pivot axis}
Definition statement
This subclass/group covers:

Pivotal movement of the temples achieved e.g. by a bending portion, "hingeless articulations".

{ Special hinge screws}
Definition statement
This subclass/group covers:

Special screws comprising e.g. blocking means, two (different) threads, special slit, cone-shape or otherwise varying cross-section, special nuts and other special elements cooperating with screws.

{ Oblique hinge axis}
Definition statement
This subclass/group covers:

Hinge comprising an oblique (not vertical) axis for enabling special folding movement of the temples, e.g. to the top or bottom of the frame rather than to the rear side.

Optical parts (characterised by the material G02B 1/00)
Definition statement
This subclass/group covers:

Elements arranged in the optical path of the eye and serving for ophthalmic purposes:

Lenses, auxiliary lenses, light deflecting elements, filters, apertures, occluders.

Design of optical elements.

Relationship between large subject matter areas

Only optical elements worn in front of or on the eye are contained in this group. Optical elements implanted into the eye (intra-ocular lenses, corneal inlays) requiring surgical interventions are classified in A61F 2/14 and A61F 2/16.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Optical elements in general
Optical elements characterized by their material
Lenses; Lens systems; { Methods of designing lenses}
Definition statement
This subclass/group covers:

Ophthalmic lenses and their design, such as e.g.

spectacle lenses, contact lenses, multifocal lenses (including bifocal, trifocal and progressive power lenses).

Methods of designing ophthalmic lenses, e.g. individual lens design

high power ophthalmic lenses, lenticular lenses

high curvature lenses.

Lenses for correcting of higher order aberrations, e.g. spherical aberration

diffractive and Fresnel ophthalmic lenses.

Lenses for inhibiting myopia progression

Mislocation tolerant ophthalmic lenses.

Lenses comprising decentered structures.

Series of ophthalmic lenses.

Semifinished ophthalmic lenses, lens blanks.

Lenses for low vision and visual disorders other than refractive errors.

Individual lens design for impaired vision, e.g. macula degeneration.

Ophthalmic lenses having features achieved by their material or material Structure (only if specific to ophthalmic lenses):

laminated lenses, gradient index, hybrid material, photorefractive material;

mathematical description of lens surfaces e.g. spheric, aspheric, toric, atoric, by conicals, polynomials, Zernicke polynomials.

Ophthalmic lenses having technical markings,

Patterned lenses (cosmetic contact lenses).

Ophthalmic lenses having special protective or antireflective coatings.

References relevant to classification in this group
This subclass/group does not cover:
Specially edged lenses for half-lens spectacles
Informative references
Attention is drawn to the following places, which may be of interest for search:
Positioning or marking of lenses (in preparation of grinding)
Tools for grinding lenses (surface)
Edging of lenses, drilling holes, cutting recesses and instruments therefor
Manufacture of plastics lenses
Applying coatings on optical elements
Surface treatment of glass
Lenses made of organic material
Optical coatings
Protective coatings
Anti-reflection coatings
Optical coatings by surface treatment
Optical systems for correcting aberrations
Diffraction optics in general
Simple lenses per se
Lenses per se defined by analytical functions
Lenses per se having non-spherical surfaces
Lenses per se having cylindrical or toric surfaces
Lenses per se having discontinous surfaces, e.g. Fresnel
Diffractive elements per se
Ophthalmic filters, sun protection
Polarizers
Special rules of classification within this group

Add suitable sub-group of G02C 2202/00

{with pattern for identification or with cosmetic or therapeutic effects (methods and processes take preference, e.g. printing, marking or copying processes B41M; identification in general G09F 3/00; producing decorative effects in general B44C; surface treatment of glass C03C 15/00 to C03C 23/00; positioning or marking of lenses B24B 13/0055) }
Definition statement
This subclass/group covers:

Markings or patterns having no effect on spectral transmission or optical properties of the lens.

Markings for technical (identification or alignment) or non-technical (decorative) purposes.

Markings on progressive lenses, fitting cross, far-, near reference point

name or symbol of manufacturer, cross-hairs for aiming.

References relevant to classification in this group
This subclass/group does not cover:
Contact lenses comprising iris pattern or (printed) pin hole
Informative references
Attention is drawn to the following places, which may be of interest for search:
Positioning or marking of lenses
Printing, marking or copying processes
Marking by laser
Producing decorative effects in general
Surface treatment of glass
Coloring having influence on spectral transmission, filters
Pin-holes and other kind of apertures formed on the lens
Identification in general
{ Ophthalmic lenses having special refractive features achieved by special materials or material structures (G02C 7/049 takes precedence) }
Definition statement
This subclass/group covers:

Lenses essentially requiring particular materials and material structures to achieve their special refractive properties:

Locally varying refractive index (index gradient, GRIN-lenses),

photorefractive materials (refractive index can be modified by illumination),

laminated lens structure.

Cellular lens surface structure.

References relevant to classification in this group
This subclass/group does not cover:
Contact lenses having special fitting or structural features achieved by their material
Special rules of classification within this group

Add one of G02C 2202/12 to G02C 2202/18 if applicable.

{ Methods of designing ophthalmic lenses}
Definition statement
This subclass/group covers:

Methods of designing lenses:

For individuals or for standard user or standard situation,

considering conditions related to the viewed object, i.e. the environment in which the lenses are intended to be used,

considering conditions related to the user,

special mathematical methods and interactive techniques.

Special rules of classification within this group

Add sub-group symbol relating to the specific type of ophthalmic lens to be designed (G02C 7/02, G02C 7/061, G02C 7/04 and sub-groups).

{ considering parameters of the viewed object}
Definition statement
This subclass/group covers:

Adapting the design and optical properties of the lens to the environment in which the lenses are intended to be used such as office, car, outdoor, particular professional environments, etc.

Generalized definition of the viewed object by defining an object distance for each direction of gaze ("Ergorama", "Objektabstandsfunktion").

{ considering wearer's parameters}
Definition statement
This subclass/group covers:
  • Considering wearing parameters determined by the spectacles frame used for mounting the lenses to be designed and by the position of the frame as worn by the user, such as pupillary distance, inclination, wrap angle, vertex distance, position on the face, centre of rotation, eye-length.
  • User dependent determination of reference points (F, N, O) on the lens.
  • Matching properties in corresponding points on the lenses in binocular use.
  • Considering the user's eye and/or head movement, choice of design dependent thereon (e.g. hard/soft design in progressive lenses).
  • Considering special ophthalmological conditions (not simple ametropia) such as higher order aberrations of the eye, visual performance, different cylindrical correction in far and near zones required (cylindrical addition and Listing's rule), magnification differences due to (considerably) different refraction of the two eyes, wearer's tolerance to imaging errors (distorsion, unwanted astigmatism, different magnification R/L).
  • Considering different correction goals for the two eyes ("monovision") such as different correction far/near, different colour filters, arrangement of far and near zones different in left and right contact lenses.
{ Special mathematical design techniques}
Definition statement
This subclass/group covers:
  • Special mathematical tools and techniques:
  • definition of boundary conditions for optimization and calculation,
  • specific type of error function, choice of coordinate systems, superposition of surfaces and techniques therefor, power vector, mathematical representation of astigmatism, ray tracing and wavefront calculation techniques.
  • Interactive design methods.
  • Simulation of the view through lenses.
Informative references
Attention is drawn to the following places, which may be of interest for search:
Complex mathematical operations
Computer aided design
3D modelling, simulation
Optical design, e.g. procedures, algorithms, optimization
Contact lenses for the eyes (disinfection or sterilisation of contact lenses A61L 12/00)
Definition statement
This subclass/group covers:

Lenses worn on the cornea or on the cornea and sclera of the eye,

corneal contact lenses (CLs), scleral contact lenses,

soft (including silicone hydrogels), rigid and combinations,

CLs for modifying the shape of the cornea, orthokeratology lenses,

CLs for inhibiting progression or development of myopia,

means for rotational and translational stability and control (ballast, slab-off),

Cls having decentered optical axis,

CLs having optical features providing tolerance to mislocation (angular),

CLs for imaging "around" a retinal skotom,

diffractive CLs,

CLs providing chromatic correction,

contact lenses suitable for containing (but not containing) medical preparations, drug delivery CLs,

cosmetic CLs,

CLs having grooves, holes for tear exchange,

CLs having specific optical or topological properties or features essentially achieved by their material.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Cases for contact lenses
Diagnostic measuring using contact lenses (e.g. glucose sensors)
Therapeutic contact lenses without optical function (e.g. bandages)
Artificial corneae and corneal implants
Intraocular lenses (multifocal, diffractive, higher order etc.
Methods or devices for treatment of the eyes
Refractive cornea treatment using laser (e.g. LASIK, ablation, disruption)
Devices for treatment of the eyes, implantable or in contact with the eye
Devices for putting in contact lenses
Refractive cornea treatment using other instruments
Ocular implants or inserts (e.g. CLs) containing (!) medical preparations to be delivered to the ocular tissue, e.g. in combination with orthokeratologic treatment, (galenics)
Disinfection or sterilisation of contact lenses
Manufacture of contact lenses
Packaging of contact lenses
Cleaning agents for contact lenses
Contact lenses characterized by their material only
Cleaning devices for contact lenses
Technical marks on CLs
Different correction for the two eyes, monovision
{bifocal; multifocal}
Definition statement
This subclass/group covers:

Contact Lenses providing bifocal, trifocal or progressively varying power:

  • simultaneous or translating type.
  • annular or sectorial configuration of the viewing zones.
  • special transition zone between viewing zones.
Informative references
Attention is drawn to the following places, which may be of interest for search:
Intraocular lenses having special configuration, e.g. bifocal
Multifocal spectacle lenses
{ Simultaneous type}
Definition statement
This subclass/group covers:

Multiple differently focussed images on the retina simultaneously formed by different regions (far/near/intermediate) of the lens.

{ Translating type}
Definition statement
This subclass/group covers:

Lens translating on the cornea generating a single image pushed by the lid(s).

Translating = bivisual = alternating.

{ Annular configuration, e.g. pupil tuned}
Definition statement
This subclass/group covers:

Far and near portions annularly (concentrically) arranged, amount of light in near or far focus determined by pupil size (pupil tuning).

{ Sectorial configuration}
Definition statement
This subclass/group covers:

Far and near portions shaped as sectors.

{ Contact lenses having an iris pattern}
Definition statement
This subclass/group covers:

Contact lenses having a (cosmetic) iris pattern.

CLs having a pinhole ("artificial pupil").

Spectral transmission in the pupil area unaffected.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Manufacture of marked or patterned contact lenses
Technical markings on the lens
Coloring having influence on spectral transmission
Special rules of classification within this group

CLs having a pinhole: add G02C 7/16

{ Contact lens fitting; Contact lenses for orthokeratology; Contact lenses for specially shaped corneae}
Definition statement
This subclass/group covers:

Adaption of the posterior lens surface to the cornea, particular posterior surfaces, e.g. ellipsoid surfaces,

individually designed CLs, methods of fitting and designing CLs,

trial contact lenses,

CLs for keratoconus, flat and irregular corneae

orthokeratology contact lenses: CLs having a rear surface shaped for controllably deforming the cornea to reduce ametropia (frequently myopia) or inhibit its development or progression,

CL design processes considering shrink and dwelling after production.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Apparatuses and methods for measuring the topograpy (curvature) of the cornea
{ Means for stabilising the orientation of lenses in the eye}
Definition statement
This subclass/group covers:

Means for stabilizing the angular position of the contact lens (rotational stabilisation) on the cornea:

prism, slab-off, particular thickness profile, ridge, etc.

particularly relevant in tranlslating bifocal CLs and toric CLs.

{ Contact lenses having special fitting or structural features achieved by special materials or material structures}
Definition statement
This subclass/group covers:

CLs essentially requiring special (e.g. rigid or soft) material to achieve specific optical or topological properties or features.

References relevant to classification in this group
This subclass/group does not cover:
Contact lenses characterized by their material only
Informative references
Attention is drawn to the following places, which may be of interest for search:
Contact lens materials in general (polymers)
bifocal; multifocal; { progressive (G02C 7/041 takes precedence) }
Definition statement
This subclass/group covers:

Spectacle lenses having more than one focal power, e.g. bifocal, trifocal, progressive lenses.

References relevant to classification in this group
This subclass/group does not cover:
Bi- multifocal, progressive contact lenses
{ Spectacle lenses with progressively varying focal power}
Definition statement
This subclass/group covers:

Lenses having a power varying (in vertical direction along a principal line) from a far vision zone along a progressive zone to a near vision zone.

Progressive lenses characterized by:

  • The shape of the progressive surface (e.g. distribution of unwanted astigmatism),
  • The properties on the principal line
  • The particular shape and location of the viewing zones
  • Special properties achieved by the cooperation of the two lens surfaces
Informative references
Attention is drawn to the following places, which may be of interest for search:
Progressive contact lenses
Methods for designing (progressive) lenses
{ Shape of the progressive surface}
Definition statement
This subclass/group covers:

Progressive lenses characterized by general aspects:

  • Distribution of unwanted astigmatism in general (Minkwitz' rule).
  • Distribution of other parameters (power, derivatives of astigmatism and spherical power, axis of astigmatism).
  • Shape of zones such as channel length and width (in general) if not determined by particular viewing task.
  • Properties on the principal line.
  • Shape size and location of the viewing zones.
  • Mutual dependence of the above properties.
  • Combination (fusion) of progressive property with other corrective surface properties (e.g. toric) on the same (!) surfacec
  • Hard / soft design and combinations, superpositions thereof on one lens surface.
{ Properties on the principal line}
Definition statement
This subclass/group covers:

Progressive spectacle lenses characterized by properties on the principal line:

  • Umbilic line.
  • Non-umbilic principal line, astigmatism on principal line accepted.
  • (mean spherical) power distribution on the principal line.
  • Run of the principal line, nasal inset, unconventional run.
  • Symmetry issues with respect to the principal line.
Informative references
Attention is drawn to the following places, which may be of interest for search:
Astigmatism vertically changing for correction purposes (cylindrical addition, near astigmatism)
{ Shape, location or size of the viewing zones}
Definition statement
This subclass/group covers:

Progressive lenses characterized by parameters related to their use:

  • Shape, size and location of viewing zones for particular viewing tasks (car driver, golf, office, musician, ...).
  • Special design for particular population (children, pre-presbyopes).
{ Special properties achieved by the combination of the front and back surfaces}
Definition statement
This subclass/group covers:

Progressive spectacle lenses characterized by combined effects of front and back surface other than combined spherical and astigmatic power:

  • Special alignment or orientation e.g. for thickness reduction (prism), appearance.
  • Lenses with progressive surface on the back side.
  • Double progressive lenses, one surface regressive.
  • Lens magnification determining the shape of both surfaces (at least one being progressive), magnification differences within lens or lens pair, choice of base curvatures dependent on magnification.
  • Progressive surface in combination with other specific surfaces on different sides (progressive and toric, atoric, aspheric, etc.)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Combination (fusion) with other (e.g. toric) corrective surface properties (on one surface!)
Auxiliary lenses; Arrangements for varying focal length
Definition statement
This subclass/group covers:

Lenses in addition to primary spectacles or contact lenses.

Spectacles comprising telescopes, loupes.

Lenses having variable focal length.

Telescopic systems comprising a positive spectacle lens + negative contact lens = Galilean telescope.

{ Ophthalmic lenses with variable focal length}
Definition statement
This subclass/group covers:

Single or compound lens element exhibiting temporarily changeable and controllable lens power (mechanical, electrostatical, pneumatic actuation).

{ Electrooptic lenses}
Definition statement
This subclass/group covers:

Lenses of which the optical index and, thus, the power are controllable.

Frequently comprising liquid crystal material.

Frequently cellular structures.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Filter lenses having liquid crystal material acting as light valve:
Non-linear optical devices
Special rules of classification within this group

Add G02C 2202/18 (cellular structures) if applicable.

{ Fluid-filled lenses, e.g. electro-wetting lenses}
Definition statement
This subclass/group covers:

Lenses comprising a (deformable) cavity which can be filled by fluid by means of pumps, etc.

Lenses comprising two immiscible fluids, the curvature of their contacting surface being electrostatically controllable (electro-wetting lenses).

Informative references
Attention is drawn to the following places, which may be of interest for search:
Fluid-filled lenses with variable focal length per se
Electrowetting lenses per se
{ Auxiliary lenses located directly on a main spectacle lens or in the immediate vicinity of main spectacles}
Definition statement
This subclass/group covers:

Auxiliary lenses (removably) attached to or adhered onto the surface of a spectacle lens or contact lens.

Clip-on auxiliary lenses.

Optical elements provided on or in a lens serving as a part of a head up display.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Mounting of auxiliary lenses
{ Lens systems mounted to spectacles}
Definition statement
This subclass/group covers:

Magnifying and telescopic spectacles, spectacles for amblyopic persons

Spectacles providing enlarged filed of vision, e.g. by anamorphic lenses or lens elements.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Telescopes per se
Special rules of classification within this group

For low vision devices add G02C 2202/10 if applicable.

Filter, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses
Definition statement
This subclass/group covers:

Coloured ophthalmic lenses with or without optical power having particular spectral transmission properties serving for sun-protection in ultra-violet, visible and infra-red wavelength ranges.

Filters having special spectral characteristics other than for sun protection.

Inhomogeneously tinted filters.

Special colouring materials.

Interference filters.

Filters having a coloured layer of constant thickness irrespective of the local thickness of the lens.

Electrooptic, photochromic filters.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Optical filters per se
Lenses having technical markings
Contact lenses having an iris pattern
Special rules of classification within this group

Filters having a coloured layer: add G02C 2202/16.

{having an electro-optical light valve (electro-optical elements per se G02F) }
Definition statement
This subclass/group covers:

Electrically controlled active filters: liquid crystal, electro-optical, electro-chromic.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Liquid crystal filters in general
Their operation
Stereoscopic displays using shutter glasses
Devices or arrangements, the optical operation of which is modified by changing the optical properties of the medium of the devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light
{ Photochromic filters}
Definition statement
This subclass/group covers:

Filters reversibly changing their absorption upon light incidence (UV), photochromic (phototropic) filter lenses.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Photochromic filters in general
{ having spectral characteristics for purposes other than sun-protection}
Definition statement
This subclass/group covers:

Filters provided for medical reasons (e.g. age related macular degeneration, dyslexia).

Filters provided to enhance visibility of traffic lights and other optical signals.

Filters provided to enhance visibility of (particularly coloured) objects in (particularly coloured) environment, e.g. tennis or golf balls.

{ having inhomogeneously distributed colouring}
Definition statement
This subclass/group covers:

Filters having only portions tinted or different colour in different portions, e.g. top dark - bottom light.

{ Interference colour filters}
Definition statement
This subclass/group covers:

Spectral transmissivity achieved by interference layers.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Interference filters in general
{ Colouring materials}
Definition statement
This subclass/group covers:

Ophthalmic filters characterized by their colouring material (dyes, pigments).

References relevant to classification in this group
This subclass/group does not cover:
Photochromic filters
Informative references
Attention is drawn to the following places, which may be of interest for search:
Dyes, pigments
Polarisers
Definition statement
This subclass/group covers:

Polarizing filters for ophthalmic purposes, e.g. sun protection.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Testing stereoscopic vision
Optical elements made of polarizing materials
Optical systems for producing stereoscopic or other 3D effects involving polarizing means
Polarizing elements per se
Stereoscopic photography by simultaneous viewing using polarized or coloured light
Stereoscopic image displaying using polarizing glasses
Mirrors; Prisms
Definition statement
This subclass/group covers:

Prisms for treating/correcting strabismus.

Prisms, mirrors for deviating the line of sight, e.g. for looking rearwardly, for looking horizontally when lying in bed.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Mirrors per se
Mounts for prisms and mirrors
Shades; shields; Obturators, e.g. with pinhole, with slot { (G02C 5/003 takes precedence) }
Definition statement
This subclass/group covers:

Shielding elements in the optical path.

Side and top shields only if arranged for limiting the field of view.

References relevant to classification in this group
This subclass/group does not cover:
Shooting or aiming glasses comprising such elements
Informative references
Attention is drawn to the following places, which may be of interest for search:
Diaphragms per se
Side shields for protection of the eyes (not in the optical path)
Iris patterns and pin holes on contact lenses
Special rules of classification within this group

Side and top shields if arranged for limiting the field of view: add G02C 11/00

pin holes (stenopaeic aperture) on contact lenses: add G02C 7/046.

{with stenopaeic apertures}
Definition statement
This subclass/group covers:

Aperture(s) producing a depth of field effect.

Attaching auxiliary optical parts (auxiliary optical parts per se G02C 7/08 to G02C 7/16)
Definition statement
This subclass/group covers:

Attachments of any auxiliary lens or system of G02C 7/086 or G02C 7/088

mounting corrective or protective lenses in goggles, diving masks, helmets,

attaching head mounted displays [HMD].

Informative references
Attention is drawn to the following places, which may be of interest for search:
HMDs per se
Spectacles allowing access to the eye
Auxiliary parts per se
Non-optical adjuncts; Attachment thereof (G02C 7/16 takes precedence)
Definition statement
This subclass/group covers:

Specially adapted (parts of) spectacles for mounting or integrating or having mounted or integrated additional elements without optical function (for the eye):

  • Protection for the ears (sound and sun), nose, mouth, protection against radio frequency radiation;
  • Cameras mounted to the frame;
  • Retroreflective elements;
  • Devices for holding articles e.g. Pencil;
  • Devices for retaining the hair;
  • Devices for delivering air or medical gaseous compositions to the nose or the eyes;
  • Devices for delivering ophthalmic solutions to the eyes;
  • Tools, e.g. Bottle opener;
  • Devices for dispensing perfumes, crèmes (cosmetic, medical), etc. To the face;
  • Anti theft devices;
  • Means for preventing wrinkles
Relationship between large subject matter areas

G02C 3/00 and subgroups concern devices for supporting spectacles.

G02C 11/00 and subgroups concern devices supported by spectacles.

Whereas G02C 11/00 concerns specially adapted (parts of) spectacles for mounting or integrating or having mounted or integrated non optical adjuncts, the non optical adjuncts themselves are classified in their respectve groups (see e.g. the informative references in the subsequent sub-groups).

References relevant to classification in this group
This subclass/group does not cover:
Shields, shades, obturators in the optical path of the eye
Informative references
Attention is drawn to the following places, which may be of interest for search:
Protection for the ears per se
Anti theft devices for spectacles per se
Special temple ends, e.g. for providing improved fit
G02C75/14E
Special rules of classification within this group

This group is only used if the spectacles comprise particular features enabling the attachment or integration of the non-optical adjunct (exception G02C 11/08.

Ornaments, e.g. exchangeable
Definition statement
This subclass/group covers:

Specially adapted (parts of) spectacles for attaching or having attached decorative or ornamental elements (frequently exchangeably).

Illuminating means
Definition statement
This subclass/group covers:

Specially adapted (parts of) spectacles for attaching or having attached illuminating means or lasers for pointing and aiming.

References relevant to classification in this group
This subclass/group does not cover:
(indicator) lights of electronic devices integrated in spectacles
Hearing aids (construction of hearing aids H04R 25/00)
Definition statement
This subclass/group covers:

Specially adapted (parts of) spectacles for attaching or having attached a hearing aids.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Microphone arrays
Hearing aids per se
Anti-misting means, e.g. ventilating, heating (H05B 3/84 takes precedence) ; Wipers
Definition statement
This subclass/group covers:

Specially adapted (parts of) spectacles for attaching or having attached:

  • Means to prevent fogging.
  • Means for cleaning the lenses during wearing.
  • Means other than shields to protect the eyes from dust or pollen, e.g. By ventilating, sealing.
  • Sealing means, attachments on the rear side of the frame front or the lenses.
References relevant to classification in this group
This subclass/group does not cover:
Heating arrangements specially adapted for transparent or reflecting areas
Informative references
Attention is drawn to the following places, which may be of interest for search:
Wipers for helmets
Ventilation for goggles
Wipers for goggles
{ Electronic devices other than hearing aids}
Definition statement
This subclass/group covers:

Specially adapted (parts of) spectacles for attaching or having attached any electronic device other than hearing aids, e.g. audio, radio, wireless devices, mp3, telephone, memory sticks, USB-devices, etc.

References relevant to classification in this group
This subclass/group does not cover:
Electronic devices for controlling electro-optic elements used as auxiliary lenses and filters
{ Side shields for protection of the eyes}
Definition statement
This subclass/group covers:

Side shields, top shields for protection against sun, dust, wind, etc.

Integral with the frame or attached thereto.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Goggles, additional functions
A61F0/02Z
Eye shades or visors for eye masks
Shields, shades, obturators in the optical path
Special rules of classification within this group

If the side or top shields are (also) intended to limit the field of view, add G02C 7/16

Assembling (producing spectacle frames from plastics or from substances in a plastic state B29D 12/02) ; Repairing; Cleaning (disinfection or sterilisation of contact lenses A61L 12/00)
Definition statement
This subclass/group covers:

Assembling, repairing, cleaning, measurements required for fitting of spectacles.

Computer assisted measurements for fitting or selecting of spectacle frames.

Protecting spectacles or parts thereof during assembling, repairing, cleaning.

Protecting spectacles or parts thereof during other procedures(e.g. during hair colouring).

Informative references
Attention is drawn to the following places, which may be of interest for search:
Cases for contact lenses
Cases for spectacles
Show cases and stands for selling spectacles
Disinfection or sterilisation of contact lenses
Cleaning in general
Grinding, polishing, edging of lenses drilling holes in lenses and instruments therefor
Moulding of plastics lenses
Manufacture of plastics frames
Compositions for cleaning of contact lenses and spectacle lenses
Cleaning of optical elements in general
{ Assembling; Repairing}
Definition statement
This subclass/group covers:

Maintenance, mounting tools.

Devices for supporting during assembling and repairing.

Apparatus for fitting eyewear (e.g heaters, tools).

{ Measuring during assembly or fitting of spectacles}
Definition statement
This subclass/group covers:

Measuring geometrical and mechanical parameters required for fitting lenses:

instruments for measuring geometrical parameters of spectacles (length of temples, width of bridges, optometrists' ruler, etc.)

Centering of lenses in the frame

Testing spectacles without involving the designated wearer

Aids for trying spectacles, test lens holder used when trying spectacles

Measuring facial proportions

Measuring geometrical parameters for aligning the lenses in the frame

Computer assisted measuring and simulations for fitting (may additionally include remote selling, simulation of user's face wearing spectacles, computer assisted choice of frames, frame portions and lens colours

References relevant to classification in this group
This subclass/group does not cover:
Instruments for determining the shape of frames
Informative references
Attention is drawn to the following places, which may be of interest for search:
Testing optical elements
Simulation of view through lenses
Data processing for shopping, remote ordering
G06Q30/00C2
Combining figures (for overlaying images of face and spectacles frame)
{Measuring geometric parameters required to locate ophtalmic lenses in spectacles frames (apparatus for testing or instruments for examining the eyes per se A61B 3/00; machines or devices and accessories for grinding the edges of lenses using spectacles as a template B24B 9/144) }
Definition statement
This subclass/group covers:

Measuring geometrical, mechanical parameters of the human head and eyes with respect to the spectacles frame required for alignment of the lenses with respect to the eye:

Inclination, pantoscopic angle, wrap angle

Pupil position with respect to the frame

Direction of view, vertical, horizontal view angles

Measuring and calculating cornea-vertex, vertex-center of rotation distance

Photographic and related methods therefor

Measuring interpupillary distance

Informative references
Attention is drawn to the following places, which may be of interest for search:
Testing eyes
Instruments for measuring the interpupillary distance
Instruments for measuring the diameter of the pupils
Measuring the human body
Positioning or marking of lenses (in preparation of edging)
Devices for grinding the edges of lenses using a lens or a spectacle frame as a template
Measurements of geometric parameters of the spectacles frame
Measuring facial proportions
Special rules of classification within this group

Instruments for measuring the interpupillary distance are classified in G02C 13/005 as well as A61B 3/111

Generic mechanical aspects applicable to one or more of the groups G02C 1/00 to G02C 5/00 and G02C 9/00 to G02C 13/00 and their subgroups
Definition statement
This subclass/group covers:

Aspects relating to the spectacles frame occurring in various frame portions and/or not constituting per se an individual constructional concept

Special rules of classification within this group

Do not use G02C 2200/00 but only its subgroups.

Do not use the subgroups of G02C 2200/00 alone but only in combination with at least one of groups G02C 1/00 to G02C 5/00 and G02C 9/00 to G02C 13/00 and their subgroups.

Magnetic means
Definition statement
This subclass/group covers:

Magnetic element for connecting parts of a frame or for attaching auxiliary elements.

Junctions between frame elements having a click function
Definition statement
This subclass/group covers:

Member providing the click function being part of one of the elements to be joined.

Locking elements
Definition statement
This subclass/group covers:

Individual element for locking a junction of frame parts, the locking element not being a part or integral with the frame parts to be joined:

Locking element in elastic hinges;

Screw locking element;

Locking elements in modular frames.

Modular frames, easily exchangeable frame parts and lenses
Definition statement
This subclass/group covers:

Elements of the frame or lenses can easily be changed without requiring tools or special skills, kits of elements.

Frames or portions made of variably combinable modules.

Frame or frame portions made from wire
Definition statement
This subclass/group covers:

Frequently metal.

Frame or frame portions made from sheet type material
Definition statement
This subclass/group covers:

E.g. metal, card board.

Laminated frame or frame portions
Definition statement
This subclass/group covers:

Frame portions or elements comprising laminated or layered structure.

Frame or frame portions made from rubber
Definition statement
This subclass/group covers:

Frame or portions made from elastic (compressible or expandable) material such as rubber or other elastomer.

Adjustment ridges or notches
Definition statement
This subclass/group covers:

Moveable junctions between frame portions (e.g. hinges, telescopic temples, inclination adjustment) comprising ridges, notches, stripes, teeth, for temporarily locking the junction in at least two discrete angular or linear positions.

Friction elements
Definition statement
This subclass/group covers:

Frame elements or portions (junctions) comprising frictionally cooperating features.

Leaf spring
Definition statement
This subclass/group covers:

Leaf spring or bent coil in hinges, elastic hinges, nose pads, temples, front frames, bridges of clip-ons, etc.

Coil spring pulled upon actuation
Definition statement
This subclass/group covers:

Coil spring extended when actuated, in elastic hinges (temple over-opened), adjustable temples, in bridges of clip-ons, closure of rims, non optical adjuncts.

Coil spring pushed upon actuation
Definition statement
This subclass/group covers:

Coil spring compressed when actuated in elastic hinges (temple over-opened), adjustable temples in bridges of clip-ons, non optical adjuncts.

Coil spring twisted upon actuation
Definition statement
This subclass/group covers:

Coil spring twisted when actuated in elastic hinges (temple over-opened), bridges of clip-ons, bridges of pince-nez.

Piston
Definition statement
This subclass/group covers:

Piston shaped element for actuating a coil spring, used in elastic hinges, collapsible frames, length adjustable temples.

Oblong hole
Definition statement
This subclass/group covers:

Non-circular hole for particular function, for mounting ornaments, in hinges for displacing the hinge axis, etc.

Generic optical aspects applicable to one or more of the subgroups of G02C 7/00
Definition statement
This subclass/group covers:

Aspects relating to the optical elements occurring in various types of lenses or other optical element and/or not constituting per se an individual constructional concept.

Special rules of classification within this group

Do not use G02C 2202/00 but only its subgroups.

Do not use the subgroups of G02C 2202/00 alone but only in combination with at least one of the subgroups of G02C 7/00.

Mislocation tolerant lenses or lens systems
Definition statement
This subclass/group covers:

Tolerance with respect to mutual misalignment of lens surfaces .

Tolerance with respect to lateral misalignment of contact lenses on the cornea.

Tolerance with respect to astigmatism axis angular misorientation of contact lenses on the cornea.

Lenses comprising decentered structures
Definition statement
This subclass/group covers:

Decentered front and back surfaces (e.g. contact lenses, progressive lenses).

Contact lenses decentered with respect to the eye.

Contact lenses having optical regions decentered with respect to the perimeter of the lens.

Contact lenses having mutually decentered optical regions.

Special ophthalmologic or optometric aspects
Definition statement
This subclass/group covers:

Disclosure relating to ophthalmologic or optometric issues in general.

Series of lenses, lens blanks
Definition statement
This subclass/group covers:

Series of lenses having a common concept, property or parameter, relations between such parameters.

Semi-finished lenses (blanks) from which representatives of such series can be maufactured.

Optical elements and systems for visual disorders other than refractive errors, low vision
Definition statement
This subclass/group covers:

Lenses and lens systems particularly designed for vision impaired persons suffering from visual deficiencies other than those related to imaging: loss of field of view, macula degeneration, brain disorders, psychological disorders, etc.

Locally varying refractive index, gradient index lenses
Definition statement
This subclass/group covers:

Lenses having a permanent local index variation, in monofocal as well as (multifocal) progressive lenses.

Photorefractive lens material
Definition statement
This subclass/group covers:

Lenses made from material the index of which is (permanently) adjustable by irradiation, light adjustable material.

Laminated or compound lenses
Definition statement
This subclass/group covers:

Lenses having laminated or layered structure, compound lens elements.

Cellular lens surfaces
Definition statement
This subclass/group covers:

Layer of cellular compartments (microcups) filled with substances having particular optical properties, e.g. liquid crystal material having electrically controllable optical index or photochromic material.

Diffractive and Fresnel lenses or lens portions
Definition statement
This subclass/group covers:

Ophthalmic lenses having a diffractive or Fresnel structure on at least a portion of at least one of its surfaces or sandwiched between two lens elements.

Correction of higher order and chromatic aberrations, wave front measurement and calculation
Definition statement
This subclass/group covers:

Correction for higher order aberrations of the lens and/or of the eye (spherical aberration, koma, oblique astigmatism) description by conicals, polynomials, Zernicke polynomials, Seidl polynomials.

Correction of chromatic aberrations of the lens and/or of the eye.

Myopia progression prevention
Definition statement
This subclass/group covers:

Lenses for inhibiting the progression of myopia or other ametropia.

This page is owned by Office of Patent Classification.
Last Modified: 10/11/2013