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Class Information
Number: 351/233
Name: Optics: eye examining, vision testing and correcting > Eye examining or testing instrument > Subjective type > Lens or filter selectively insertable in optical path
Description: Subject matter wherein the instrument includes selective lenses or spectacle frames carrying lenses of different power movable into and out of eye testing position until errors of refraction are determined, proper lenses have been found and/or corrected vision is obtained.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7533992 |
Light source for diagnostic instruments |
May. 19, 2009 |
| 7533993 |
Method and apparatus for correcting vision using an electro-active phoropter |
May. 19, 2009 |
| 7441896 |
Macular pigment measurements |
Oct. 28, 2008 |
| 7438416 |
Optometric apparatus |
Oct. 21, 2008 |
| 7413306 |
Sphero cylindrical eye refraction system using fluid focus electrostatically variable lenses |
Aug. 19, 2008 |
| 7264354 |
Method and apparatus for correcting vision using an electro-active phoropter |
Sep. 4, 2007 |
| 7258438 |
Retinal flux density meter and method of use |
Aug. 21, 2007 |
| 7144112 |
Optometric apparatus |
Dec. 5, 2006 |
| 6939007 |
Photochromic bis-naphthopyran compounds and methods for their manufacture |
Sep. 6, 2005 |
| 6749303 |
Optometry apparatus and diffraction grating plate used in the same |
Jun. 15, 2004 |
| 6733128 |
Microscope for noncontact wide-angle viewing |
May. 11, 2004 |
| 6698888 |
Ophthalmic refractor having improved repeatability of scale rotation |
Mar. 2, 2004 |
| 6666555 |
Ophthalmic refractor having retrofittable readout illumination |
Dec. 23, 2003 |
| 6471354 |
Apparatus for creating visual power of a blind person |
Oct. 29, 2002 |
| 6270219 |
Plastic trial lens, its injection molded article and its molding apparatus |
Aug. 7, 2001 |
| 6149275 |
Apparatus for selection of an optical lens |
Nov. 21, 2000 |
| 5648833 |
Motorized instrument for the examination of human eyes |
Jul. 15, 1997 |
| 5617157 |
Computer controlled subjective refractor |
Apr. 1, 1997 |
| 5596378 |
Lens selection system |
Jan. 21, 1997 |
| 5585874 |
Color imaging convergence projector |
Dec. 17, 1996 |
| 5302982 |
Projector slide apparatus |
Apr. 12, 1994 |
| 5287129 |
Fundus camera |
Feb. 15, 1994 |
| 5285224 |
Methods and apparatus for determining refractive error |
Feb. 8, 1994 |
| 5237350 |
Ophthalmic photographic apparatus using a fluorescent agent |
Aug. 17, 1993 |
| 5223864 |
Phoropter |
Jun. 29, 1993 |
| 5067806 |
Quick screening for scotopic sensitivity syndrome |
Nov. 26, 1991 |
| 4988185 |
High add bifocal spectacles and methods of prescribing |
Jan. 29, 1991 |
| 4887897 |
Eye examining apparatus |
Dec. 19, 1989 |
| 4844607 |
Vision tester with color corrected illuminating system |
Jul. 4, 1989 |
| 4564274 |
Visibility gauge |
Jan. 14, 1986 |
| 4407571 |
Compact refraction instrument |
Oct. 4, 1983 |
| 4368958 |
Arrangement for determining the points of penetration of eyeglass areas by visual axes |
Jan. 18, 1983 |
| 4243304 |
Convergence mechanism for binocular refracting instrument |
Jan. 6, 1981 |
| 4190331 |
Ophthalmic measuring instrument with angle measuring means |
Feb. 26, 1980 |
| 4145123 |
Perimeter |
Mar. 20, 1979 |
| 4105303 |
Method for determining the refractive correction for an eye |
Aug. 8, 1978 |
| 4045130 |
Apparatus for the perimetric testing of the visual field of the human eye |
Aug. 30, 1977 |
| 4015899 |
Eye test apparatus with physician routed patient input adjustment to variable optical elements |
Apr. 5, 1977 |
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