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| Class Numbers & Titles | Class Numbers Only | USPC Index | International | HELP |
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Class 351 | OPTICS: EYE EXAMINING, VISION TESTING AND CORRECTING |
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| 200 | EYE EXAMINING OR TESTING INSTRUMENT |
| 201 | For fusion and space perception testing (e.g., stereoscopic vision) |
| 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 |
| 211 | Including projected target image |
| 213 | Including light filter or absorber |
| 214 | Including diaphram or slit |
| 215 | Including light polarizing means |
| 216 | Including lens selectively insertable in optical path |
| 219 | With contact lens |
| 220 | Including reflectors with off-set surfaces |
| 221 | Including illuminator |
| 222 | Subjective type |
| 223 | Self examining type |
| 224 | Perimeter type |
| 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 |
| 237 | Including target image projection |
| 239 | Including test chart or target |
| 245 | Support |
| 246 | Methods of use |
| 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) |
| 49 | Polarizing |
| 50 | With rear-view reflectors |
| 51 | With decoration or ornamentation |
| 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) |
| 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 |
| 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 |
| 76 | With adjustable or rockable nose grips or pads |
| 78 | Nose pads or cushions |
| 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 |
| 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 | ![]() |