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.

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.

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 - 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).

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 .

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

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).

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

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

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.

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

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:

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

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

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

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).

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

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

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

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.

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

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

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

Lorgnon, lorgnette.

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

combination of spectacles and cases.

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.

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

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.

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

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).

Spectacles comprising individually pivotable (vertically, horizontally) rims.

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

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

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).

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 - G02C 2200/16 if applicable.

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.

Horizontally split bridges: add G02C 1/08.

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

Hinge or other element enabling folding on the bridge.

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

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.

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

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

Exchangeable pads or pads providing particular fit and comfort.

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

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

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.

Special temple ends: individual, wired, securing means.

Temples having no ear piece (shortened temples).

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.

Resiliently deformable temple or temple parts.

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

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

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.

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.

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

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

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.

If applicable add suitable subgroup of G02C 2200/00.

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:

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

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

Resilient part other than a coil spring generating an elastic effect

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

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.

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

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.

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.

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.

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.

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.

Add suitable sub-group of G02C 2202/00

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.

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.

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

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.

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).

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").

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.

Contact Lenses providing bifocal, trifocal or progressively varying power:

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

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

Translating = bivisual = alternating.

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

Far and near portions shaped as sectors.

Contact lenses having a (cosmetic) iris pattern.

CLs having a pinhole ("artificial pupil").

Spectral transmission in the pupil area unaffected.

CLs having a pinhole: add G02C 7/16

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.

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.

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

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

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:

Progressive lenses characterized by general aspects:

Progressive spectacle lenses characterized by properties on the principal line:

Progressive lenses characterized by parameters related to their use:

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

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.

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

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

Frequently comprising liquid crystal material.

Frequently cellular structures.

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

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).

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.

Magnifying and telescopic spectacles, spectacles for amblyopic persons

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

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

Coloured ophthalmic lenses with or without optical power having particular spectral transmission properties serving for sun-protection in ultraviolet, visible and infrared 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.

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

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

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

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.

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

Spectral transmissivity achieved by interference layers.

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

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

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.

Shielding elements in the optical path.

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

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.

Aperture(s) producing a depth of field effect.

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].

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

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).

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.

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

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

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

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

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.

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

Integral with the frame or attached thereto.

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

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).

Maintenance, mounting tools.

Devices for supporting during assembling and repairing.

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

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

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

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

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

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 - G02C 5/00 and G02C 9/00 - G02C 13/00 and their subgroups.

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

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

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.

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.

Frequently metal.

E.g. metal, card board.

Frame portions or elements comprising laminated or layered structure.

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

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.

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

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

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

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

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

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

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.

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.

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.

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.

Disclosure relating to ophthalmologic or optometric issues in general.

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.

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.

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

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

Lenses having laminated or layered structure, compound lens elements.

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.

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 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.

Lenses for inhibiting the progression of myopia or other ametropia.