|
Match
|
Document |
Document Title |
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
3860330 |
REFRACTOR WITH A SYNCHRONIZED CYLINDER LENS AXIS AND CROSS CYLINDER LENS AXIS
This is a refractor having movement of the axis of the cross cylinder lens used for the Jackson cross cylinder technique, synchronized with movement of the axis of the presented cylinder lens.
|
|
|
3811756 |
DUAL IMAGE REFRACTION TESTING DEVICE
A device for receiving light from a single source and producing two parallel image outputs having equal intensity. Totally reflective mirrors receive light from the source through lenses and...
|
|
|
3792918 |
LASER REFRACTOR
A laser refractor which utilizes the diffuse reflection of laser light from the interior surface of a slowly rotating drum in order to produce an interference pattern whose apparent motion is a...
|
|
|
3698799 |
CROSS CYLINDER FLIP MECHANISM
In an ophthalmic refractor improved cross cylinder flip mechanism comprises a cross cylinder lens rotatably mounted in a loupe by means including a pinion meshed with a face gear, the latter being...
|
|
|
3655276 |
OPHTHALMIC REFRACTING CHART PROJECTOR
An ophthalmic refracting chart projector with rotary slide discs having removable slides. Operating controls permit selective showing of slides in a desired sequence. Astigmatic charts may also be...
|
|
|
3574450 |
METHOD AND APPARATUS FOR DETERMINING THE EFFECTIVENESS OF SPATIAL VISION
A method and apparatus for testing the spatial vision of a subject by obtaining averaged evoked cortical responses produced by various patterned stimuli; and by obtaining such responses produced by...
|
|
|
3424519 |
VISUAL PARAMETER TESTER
|
|
|
3041927 |
Abnormal color sense correcting apparatus
|
|
|
3012472 |
Eye testing apparatus
|
|
|
2893288 |
Portable eye-testing apparatus
|
|
|
2835161 |
Optometrical apparatus
|