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| Number | Title | Issue Date |
| 7438416 | Optometric apparatus An optometric apparatus for examining refractive power of an examinee's eye subjectively, capable of performing highly-precise examination. The apparatus has a test window through which a presented optotype is seen, a first spherical-power applying unit which applie... | 10/21/2008 |
| 7267439 | Optometric apparatus, optometric method, and optometric server An optometric apparatus and an optometric method includes the steps of acquiring subject's attributes and an orientation selected by the subject on an astigmatic axis determination chart displayed on the computer screen, displaying vision measurement charts in the a... | 09/11/2007 |
| 7144112 | Optometric apparatus An optometric apparatus (2) includes a rotary prism (136a, 136b) disposed in front of the eye (E), for adding a prism degree to the eye (E); a rotation device including a pulse motor (181, 184) and a rotation transmitting me... | 12/05/2006 |
| 6698888 | Ophthalmic refractor having improved repeatability of scale rotation A subjective ophthalmic refractor of a type comprising a ring-shaped cylinder power scale having an internal gear actuated by a scale drive gear connected to a cylinder power adjustment knob of the refractor is improved by providing a bearing insert withi... | 03/02/2004 |
| 6692128 | Ophthalmic refractor having gear phasing hub A subjective ophthalmic refractor comprises a cylinder power adjustment knob for simultaneously actuating a cylinder power scale and an indexable lens carrier drive assembly. The drive assembly includes a gear phasing hub designed to allow a scale marking... | 02/17/2004 |
| 5861941 | Eyeglass display rack with vision tester A vision tester comprising a front wall and a back wall. Printed matter comprising words appears on the back wall, which is approximately 14 inches (35.6 cm.) from the front wall. The printed matter is exposed to ambient light from the top and front. The ... | 01/19/1999 |
| 5729324 | Presbyometer including lockstep means A presbyometer for aid in selecting the appropriate strength of over-the-counter (OTC) reading glasses is disclosed. The device comprises a view assembly with a pair of rotational lens wheels. The lens wheels each have a plurality of spaced apart aperture... | 03/17/1998 |
| 5648833 | Motorized instrument for the examination of human eyes A phoropter comprises two observation channels, in each of said observation channels a plurality of disk-shaped mounts, rotatably seated about at least one axis, for mounting optically effective members and drive means for rotating said mounts. The drive ... | 07/15/1997 |
| 5486879 | Portable, public use reading glasses eye tester Two identical plates somewhat in the shape of very large eyeglass frames sandwiching two rotable discs, one for each eye, form the front section of the device. Each disc has a series of magnifying lenses of increasing power which can be brought into the e... | 01/23/1996 |
| 5381196 | Contrast sensitivity tester A device for testing visual contrast sensitivity is disclosed whereby the contrast between a vectographically polarized test symbol and a reference background may be continuously varied by changing the direction of polarization of a polarization analyzer ... | 01/10/1995 |
| 5347330 | System and method using the Pulfrich stereo-illusion phenomenon to screen eyes and detect ocular and optic nerve disease A simple and relatively inexpensive system has been developed for screening people both with normal vision and those with ocular and optic nerve disease using the Pulfrich stereo-illusion phenomenon. The system uses an audio/visual recording showing a bal... | 09/13/1994 |
| 5281984 | Illumination apparatus for ophthalmic refractors An illuminator assembly is provided for ophthalmic refractors which is formed as a singular light guide formed in unitary fashion of a transparent polymeric material. The light guide includes a light input portion located adjacent an incandescent light so... | 01/25/1994 |
| 5278593 | Ophthalmic dial advancement system An ophthalmic dial advancement system for vision testing apparatuses, such as ophthalmic refractors of the type which utilize a single dial sphere control for advancing the lens power of at least one of the lenses positioned within the lens housing. A rot... | 01/11/1994 |
| 5120124 | Devices for determining the crossed cylinder powers and axes for multiple lens sets Apparatus and techniques for measuring and determining the crossed cylinder powers and axes obtained through independent rotation of cylinder lenses are disclosed. Degree scales associated with each lens provide angular measurements for use in connection ... | 06/09/1992 |
| 4943162 | Astigmatic self-refractor and method of use A new lens system and method of use for otherwise conventional refractors comprising a five-lens, variable crossed cylinder lens attachment and selectable fixed crossed cylinders which may be placed in the examining optical path. The variable crossed cyli... | 07/24/1990 |
| 4887897 | Eye examining apparatus An eye examining apparatus has an eye examining lens of an elastic material opposed to an eye to be examined, and control means for causing the marginal portion of the eye examining lens to protrude or sink to thereby change the lens surface of the eye ex... | 12/19/1989 |
| 4840479 | Crossed cylinder lenses refractor with three-lens variable crossed cylinder assembly and method of use A new lens system and method of use for otherwise conventional refractors comprising a synchronized, three-lens, variable crossed cylinder lens attachment and selectable fixed crossed cylinders which may be placed in the examining optical path. The synchr... | 06/20/1989 |
| 4820040 | Crossed cylinder lenses refractor and method of use A new lens system and method of use for otherwise conventional refractors comprising a synchronized, variable crossed cylinder lens attachment and selectable fixed crossed cylinders which may be placed in the examining optical path. The synchronized, vari... | 04/11/1989 |
| 4798457 | Self-conscious type eye examining apparatus A self-conscious type eye examining apparatus is provided with a Stokes' cross cylinder in a view field window, a spherical lens group having a plurality of spherical lenses selectively disposed in the optical path of the cross cylinder, a first electric ... | 01/17/1989 |
| 4606624 | Refractor having simplified cylinder lens assembly Disclosed is a refractor of the type having a housing which has patient eye position for viewing along a sight axis extendible therethrough, a pair of superimposed cylinder lens assemblies, means for positioning a particular lens in front of the sight axi... | 08/19/1986 |
| 4576454 | Eye fatigue simulator for optometry A simulation card for simulating the eye fatigue of a user of a display screen. The simulation card is adapted to mount in front of a lens changing apparatus. An opening in the card permits the eye doctor to examine the patients eyes while the patient foc... | 03/18/1986 |
| 4523822 | Refractor with optically encoded cylinder axis position An ophthalmic refractor is provided which is configured for carrying out the Jackson cross-cylinder test. To improve accuracy, an optical encoder is provided in conjunction with each cylinder axis control knob and in conjunction with the lens mount of the... | 06/18/1985 |
| 4500180 | Motorized refraction apparatus An improved refractor for use in the subjective examination of human eyes. Each half of the refractor includes a plurality of lens supporting disks, a hub assembly for rotatably supporting the disks, and a comb assembly to space the disks along the optica... | 02/19/1985 |
| 4496225 | Motor control system for motorized ophthalmic instrument An improved refractor for use in the subjective examination of human eyes. Each half of the refractor includes a plurality of lens supporting disks, a hub assembly for rotatably supporting the disks, and a comb assembly to space the disks along the optica... | 01/29/1985 |
| 4496226 | ANDed motor control system for motorized ophthalmic instrument An improved refractor for use in the subjective examination of human eyes. Each half of the refractor includes a plurality of lens supporting disks, a hub assembly for rotatably supporting the disks, and a comb assembly to space the disks along the optica... | 01/29/1985 |
| 4436390 | Ophthalmic instrument having a cross cylinder lens An ophthalmic instrument having a cylindrical test lens and a cross cylinder lens which are adapted to be placed in an examining optical path. The cross cylinder lens is mounted on a lens tube which is rotatably mounted on a swingable lever about a pivot ... | 03/13/1984 |
| 4355878 | Magnetic device A hold releasing magnetic device so designed that by controlling the current supply to a magnet the armature is displaced relative to the yoke so as to release a held shutter member wherein the armature and the yoke are supported coaxially with each other... | 10/26/1982 |
| 4192582 | Ophthalmometer Ophthalmometer comprising a chart projecting optical system for projecting a Landolt type inspection chart and a lens means for locating a corrective lens in the projecting light path. A manually operated switch is provided for actuation by a patient. A m... | 03/11/1980 |
| 4185896 | Refractor cross-cylinder apparatus A pair of cylinder lenses have a combined power of zero when their cylinder axes are parallel and a small cross cylinder power when one lens is rotated until its axis is perpendicular to the cylinder axis of the other lens. Cross-cylinder lenses are used ... | 01/29/1980 |
| 3969020 | Automatic refraction apparatus and method Apparatus and method provide for automatically measuring the refractive error of the human eye and thus the prescription for lens or eye glasses for correcting this error. Test symbols are alternately presented at two different locations on a test screen ... | 07/13/1976 |
| 3936163 | Vision examination lens system An optical system utilizing a single spherical and two cylindrical lenses. The cylindrical lenses are located along the optical axis of the spherical lens and between the spherical lens aand an optical target. A first of the cylindrical lenses is fixed lo... | 02/03/1976 |
