Manual of U.S. Patent Classification
as of June 30, 2000

Class
351
OPTICS: EYE EXAMINING, VISION TESTING AND CORRECTING

Class definitions may be accessed by clicking on the class title, above.
Subclass definitions may be accessed by clicking on the subclass number, below.

Patents classified in a subclass may be accessed by clicking on the " " icon following the subclass number, below.

( please note that links to definitions and classified patents may not be available for some classes and subclasses )

For search strategies, please refer to the Classification Index Explanation of Data web page.

Subclass		Title
ClassTitle		===> OPTICS: EYE EXAMINING, VISION TESTING AND CORRECTING
200		EYE EXAMINING OR TESTING INSTRUMENT
201		. For fusion and space perception testing (e.g., stereoscopic vision)
202		. . Of abnormal muscular functioning
203		. Eye exercising or training type
204		. For interpupillary distance measuring or lens positioning
205		. Objective type
206		. . Including eye photography
207		. . . Having spurious reflection blocking
208		. . . Having means to detect proper distance or alignment (i.e., eye to instrument)
209		. . Including eye movement detection
210		. . . Using photodetector
211		. . Including projected target image
212		. . . For cornea curvature measurement
213		. . Including light filter or absorber
214		. . Including diaphram or slit
215		. . Including light polarizing means
216		. . Including lens selectively insertable in optical path
217		. . . On rotary disc
218		. . . . Hand held type
219		. . With contact lens
220		. . Including reflectors with off-set surfaces
221		. . Including illuminator
222		. Subjective type
223		. . Self examining type
224		. . Perimeter type
225		. . . With rotatable arm
226		. . . With bowl type screen
227		. . Including trial frame
228		. . . With multifocal lens
229		. . . With plural lens carrier
230		. . . With individual lens holder
231		. . . Removably attachable to eye glass frame
232		. . With light polarzing lens
233		. . Lens or filter selectively insertable in optical path
234		. . . Mounted on rotatable disc
235		. . . . Having plural disc carrier
236		. . . Movable along optical axis
237		. . Including target image projection
238		. . . Tachistoscope type
239		. . Including test chart or target
240		. . . Stereoscopic type
241		. . . Astigmatism type
242		. . . Chromaticity type
243		. . . Illuminated
244		. . . Having support or cabinet
245		. Support
246		. Methods of use
247		. . For contact lens fitting
41		SPECTACLES AND EYEGLASSES
42		. Lens repair devices
43		. Floating or underwater type
44		. With antiglare or shading
45		. . Partially occluding the light-path area
46		. . Perforated opaque plates or shields
47		. . Removable and/or adjustable filters or screens (e.g., clip-on type)
48		. . . Spring biased
49		. . Polarizing
50		. With rear-view reflectors
51		. With decoration or ornamentation
52		. . Detachably secured
53		. Shooting type
54		. Invertible or reversible multifocal type
55		. With vertical adjustment of multifocal lenses
56		. Lorgnette type
57		. With auxiliary lenses movable in and out of the optical path (e.g., clip-on type attachments)
58		. . Spring biased or secured by friction members
59		. Lens pivots in and out of optical path
60		. With lens suspension bar (e.g., torsion bar)
61		. U-shape or half-moon lens below eye level
62		. With moisture prevention or absorption
63		. Folding
64		. . Pince-nez type
65		. Pince-nez type (including pince-nez bridges, nose grips and nose pads therefor)
66		. . With ear chain or temple
67		. . Plural bridges
68		. . With resilient extensible bridge
69		. . Lens and nose grip movable on flexible bridge
70		. . Posts or studs connecting bridge and nose grip
71		. . With spring biased nose grips
72		. . . With pivoting levers
73		. . . . With flat spiral springs
74		. . . . With springs below bridge
75		. . . . With springs encased
76		. . With adjustable or rockable nose grips or pads
77		. . . With ball joints
78		. . Nose pads or cushions
79		. . . Plural pad parts engage the nose
80		. . . Detachable
81		. . . Perforated or serrated
82		. . . Fluid-filled or suction type
83		. Continuous rim mounting
84		. . With rotating means for multifocal lenses
85		. . Upper rim portion slotted
86		. . With lens retaining or locking means
87		. . Nose guards or pads integral with frame
88		. . Nose guards or pads removable or adjustable
89		. . With brace arm temple support
90		. Split rim mounting
91		. . With brow pieces or top arms
92		. . . Screwless lens mounting
93		. . With brace arm supports for temple or lens
94		. . With auxiliary bridge
95		. . Expansible and contractible lens rim
96		. . Locking member secures lens against rotation
97		. . Split connected by U-clamps or pivot links
98		. . Split on nasal side of rim (i.e., at bridge)
99		. . Clamp and temple pivot screw spaced along rim clamping arm
100		. . Clamp and temple pivot screw coincident on rim clamping arm
101		. . Metal clamps embrace the rims and connect to bridge and/or temples
102		. . Combined metal and plastic rims
103		. Brace arm or semi-rimless mounting
104		. . Arm or rim of plastic or of different material (e.g., metal and plastic)
105		. . Detachable brace arm
106		. . Screwless lens mounting
107		. . With adjustable lens or frame part
108		. . Brace arm supports lens at two spaced points or constitutes a partial rim
109		. . Brace arm extends along edge of lens
110		. Rimless mounting
111		. Temples
112		. . With pocket clip or clasp
113		. . Spring biased
114		. . Resilient or flexible
115		. . Reversible or axially rotatable
116		. . Detachable
117		. . With covered core or rod (e.g., reinforced)
118		. . Extensible (e.g., with adjustable sleeve member
119		. . Two-part type (e.g., jointed)
120		. . Inclined to lens plane
121		. . With connector
122		. . With skin protecting earpiece covering
123		. . With head or ear engaging attachments
124		. Bridges
125		. . Crossbar type
126		. . Flexible
127		. . . Ball or chain type
128		. . Adjustable
129		. . Reinforced
130		. . With auxiliary support
131		. . With nose grip or guard integral with bridge
132		. . With nose grip, nose guard, pad, or cushion
133		. . With connectors or straps
134		. . . Unitary bridge and straps
135		. . . With lens clamping straps
136		. Nose pads or cushions
137		. . Adjustable, rockable, or pivotable
138		. . Detachable
139		. . With cover or coating
140		. Connectors
141		. . With screw locking means
142		. . Strap type
143		. . . With particular bracing bar or stud
144		. . . With cementing or fusing
145		. . . With cushion around lens screw or bolt
146		. . . . Sleeve or bushing
147		. . . With serrated interengaging parts
148		. . . Adjusting
149		. . . With interengaging projection and recess
150		. . . With resilient parts (e.g., resilient strap arms)
151		. . . . Spring between lens and strap
152		. . . With clamping arms
153		. . With particular hinge
154		. Lens linings or rims
155		. With support or holder (e.g., on hat or cap)
156		. . With head embracing bow or chain
157		. . Neck retainers
158		. Combined
159		. Ophtahalmic lenses or blanks
160R		. . Eye contact type
161		. . . Multifocal
162		. . . Colored
160H		. . . Hydrophilic
163		. . With light filtering means
164		. . . Multifocal
165		. . . With sections of different light absorption
166		. . With lens protective layers
167		. . Cataract correction type
168		. . Multifocal
169		. . . Gradually varying focal power
170		. . . With prismatic segment
171		. . . Three or more foci
172		. . . Multiple elements
173		. . Image size (aniseikonia) correction
174		. . With beveled, polished or reinforced edges
175		. . Prismatic type
176		. . Focus and/or astigmatism correction
177		. . Methods
178		. Methods (e.g., securing lenses in mountings)

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Last Modified: 6 October 2000