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Class Information
Number: 351/241
Name: Optics: eye examining, vision testing and correcting > Eye examining or testing instrument > Subjective type > Including test chart or target > Astigmatism type
Description: Subject matter comprising eye test charts having for example changeable color lines or colored contour bands, to determine the axis and amount of astigmatism and the required cylindrical lens axis.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7407290 |
Method of inspecting monocular diplopia and eye mark pattern for use in the same |
Aug. 5, 2008 |
| 5627612 |
Ophthalmic apparatus having program storing means |
May. 6, 1997 |
| 5223865 |
Method and apparatus for measuring visual function |
Jun. 29, 1993 |
| 4679921 |
Apparatus for eye examination |
Jul. 14, 1987 |
| 4217048 |
Viewfinder capable of adjusting diopter |
Aug. 12, 1980 |
| 4179196 |
Compact subjective refractive instrument |
Dec. 18, 1979 |
| 4113363 |
Process and apparatus for astigmatic and spherical subjective testing of the eye |
Sep. 12, 1978 |
| 4094592 |
Ophthalmic examination chart projector |
Jun. 13, 1978 |
| 3947097 |
Process and apparatus for astigmatic and spherical subjective testing of the eye |
Mar. 30, 1976 |
| 3947186 |
Eye-test lens and method |
Mar. 30, 1976 |
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