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Class Information
Number: 351/234
Name: Optics: eye examining, vision testing and correcting > Eye examining or testing instrument > Subjective type > Lens or filter selectively insertable in optical path > Mounted on rotatable disc
Description: Subject matter wherein the person undergoing eye examination views a test object through test lenses mounted in a circle on one or several rotatable discs, each lens having a different spherical, cylindrical or light absorbing power.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7438416 |
Optometric apparatus |
Oct. 21, 2008 |
| 7144112 |
Optometric apparatus |
Dec. 5, 2006 |
| 6698888 |
Ophthalmic refractor having improved repeatability of scale rotation |
Mar. 2, 2004 |
| 6692128 |
Ophthalmic refractor having gear phasing hub |
Feb. 17, 2004 |
| 5861941 |
Eyeglass display rack with vision tester |
Jan. 19, 1999 |
| 5729324 |
Presbyometer including lockstep means |
Mar. 17, 1998 |
| 5648833 |
Motorized instrument for the examination of human eyes |
Jul. 15, 1997 |
| 5486879 |
Portable, public use reading glasses eye tester |
Jan. 23, 1996 |
| 5381196 |
Contrast sensitivity tester |
Jan. 10, 1995 |
| 5347330 |
System and method using the Pulfrich stereo-illusion phenomenon to screen eyes and detect ocular and optic nerve disease |
Sep. 13, 1994 |
| 5281984 |
Illumination apparatus for ophthalmic refractors |
Jan. 25, 1994 |
| 5278593 |
Ophthalmic dial advancement system |
Jan. 11, 1994 |
| 5120124 |
Devices for determining the crossed cylinder powers and axes for multiple lens sets |
Jun. 9, 1992 |
| 4943162 |
Astigmatic self-refractor and method of use |
Jul. 24, 1990 |
| 4887897 |
Eye examining apparatus |
Dec. 19, 1989 |
| 4840479 |
Crossed cylinder lenses refractor with three-lens variable crossed cylinder assembly and method of use |
Jun. 20, 1989 |
| 4820040 |
Crossed cylinder lenses refractor and method of use |
Apr. 11, 1989 |
| 4798457 |
Self-conscious type eye examining apparatus |
Jan. 17, 1989 |
| 4606624 |
Refractor having simplified cylinder lens assembly |
Aug. 19, 1986 |
| 4576454 |
Eye fatigue simulator for optometry |
Mar. 18, 1986 |
| 4523822 |
Refractor with optically encoded cylinder axis position |
Jun. 18, 1985 |
| 4500180 |
Motorized refraction apparatus |
Feb. 19, 1985 |
| 4496225 |
Motor control system for motorized ophthalmic instrument |
Jan. 29, 1985 |
| 4496226 |
ANDed motor control system for motorized ophthalmic instrument |
Jan. 29, 1985 |
| 4436390 |
Ophthalmic instrument having a cross cylinder lens |
Mar. 13, 1984 |
| 4355878 |
Magnetic device |
Oct. 26, 1982 |
| 4192582 |
Ophthalmometer |
Mar. 11, 1980 |
| 4185896 |
Refractor cross-cylinder apparatus |
Jan. 29, 1980 |
| 3969020 |
Automatic refraction apparatus and method |
Jul. 13, 1976 |
| 3936163 |
Vision examination lens system |
Feb. 3, 1976 |
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