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| Number | Title | Issue Date |
| 4396258 | Concentric drums target support system for ophthalmic instrument A compact refraction instrument for use in both the objective and subjective examination of human eyes. The instrument incorporates an alignment mode, a retinoscopy mode, a distance mode and near mode. For carrying out the functions associated with these ... | 08/02/1983 |
| 4368959 | Apparatus for and method of testing vision The apparatus and method comprise means to evaluate the interocular latency difference known to exist in individuals afflicted with multiple sclerosis. The apparatus includes two horizontal rows of 10 light emitting diodes separated by a horizontal partit... | 01/18/1983 |
| 4365874 | Oculotorsionometer An apparatus for measuring torsional rotation of an eyeball about the visual axis by means of an afterimage. The apparatus includes a frame mountable to a patient so as to be fixed with respect to the patient's skull. Mounted on the frame are means for cr... | 12/28/1982 |
| 4353626 | Visual recognition testing apparatus Visual recognition testing apparatus is described which has a master array of individually selectable areas to be illuminated and a slave array of individual areas to be illuminated. A test sheet can be superimposed in front of the two arrays so as to sho... | 10/12/1982 |
| 4346968 | Wall mounted visual field testing system A visual field testing unit having a thin, light-weight screen adapted for mounting on an inside building wall and having a plurality of individually energizable substantially point light sources across its surface but behind a semi-transparent screen so ... | 08/31/1982 |
| 4324460 | Method and apparatus for testing flicker fusion frequency Apparatus for testing temporal vision including a target light produced on a portion of a viewing area. A boundary is provided between the target light and a background light, such being produced on substantially all of the viewing area. A first oscillato... | 04/13/1982 |
| 4293200 | Visual faculty testing apparatus Visual faculty testing apparatus is proposed to facilitate contrast sensitivity assessment. Existing procedures are limited and involve the presentation to a subject of a target of which the overall contrast is varied to determine the minimum level at whi... | 10/06/1981 |
| 4285580 | Color vision perception testing device A controlled color source used in testing color vision perception includes a cathode ray tube capable of producing the three primary colors and at least one photo-detector array coupled directly to the tube screen for sensing the primary color output of t... | 08/25/1981 |
| 4283126 | Method and apparatus for eye refraction determination Method and apparatus for determining eye refraction using corrective lenses comprising projecting the corrective lens by means of an optical system into the pupil of the eye or in a predetermined spaced relation in front of said pupil, e.g., via a splitti... | 08/11/1981 |
| 4279479 | Vision screening kit A simple, inexpensive vision screening device in the form of a compact kit.... | 07/21/1981 |
| 4274716 | Ocular fixation device An ocular fixation device for mounting on an ophthalmological examination instrument used for examining the eyes of a patient comprises a pair of light emitters mounted for individual left and right eye viewing by the patient. The light emitters are conne... | 06/23/1981 |
| 4274715 | Method and apparatus for the projection of optical test objects Method and apparatus for projecting or imaging optotypes so that they can be perceived in space under conditions of unimpeded vision without requiring, e.g., projection screens.... | 06/23/1981 |
| 4255023 | Objective retinal response recorder A retinal response recorder that is fully automatic, comprises a light stimulator, with means for a patient to position his head, such that his eye is on the horizontal axis of the stimulator. Means are provided for selecting any one of the selected numbe... | 03/10/1981 |
| 4253470 | Marcus-Gunn quantitator A device for quantitating afferent optic nerve defects is disclosed. The device is particularly adapted for use in examining optic nerve defects which produce a Marcus-Gunn pupil.... | 03/03/1981 |
| 4239351 | Apparatus for generating and displaying visual acuity targets First and second electro-optical display devices for displaying visual acuity targets, one of which is adapted to be viewed by a patient and the other of which is adapted to be viewed by an examiner. An electronic memory is connected to the display device... | 12/16/1980 |
| 4222639 | Apparatus and system for analyzing fixation disparity Apparatus is provided for testing subjects for fixation disparity. The apparatus includes a first sheet-like element having an opening therein which is spaced from the subject being tested. This opening defines the periphery of a target which is dimension... | 09/16/1980 |
| 4212520 | Eye testing device The eye testing device for testing visual acuity includes a light-colored, opaque front chart having a plurality of cut-out openings in the shape of letters, numerals, or similar characters and a black box located behind the chart for absorbing ambient li... | 07/15/1980 |
| 4188097 | Method of and apparatus for testing visual integrity A method of and apparatus for determining the visual integrity of an individual is disclosed. An equal amount of visible light intensity is provided to the right and left eyes by viewing a target through a binocular viewing mechanism. The eyes of the indi... | 02/12/1980 |
| 4179196 | Compact subjective refractive instrument A compact ophthalmic instrument for refraction of patient's eyes is obtained by substantial folding of the optical system. The optical system is folded in one location using a reflection means that moves to vary the location of a target image being viewed... | 12/18/1979 |
| 4169664 | Apparatus for determining peripheral vision An apparatus for use in determining the peripheral vision extent of a patient's eye includes a contact lens type construction detachably fitted to the eye having multiple optical fibers each extending to an illuminating source. Upon illumination of a sele... | 10/02/1979 |
| 4155632 | Method and apparatus for testing vision The disclosure relates to a method and apparatus for testing eyesight in the presence of controlled varying degrees of contrast at a target which is being viewed. The contrast ratio of the illumination of the portion of a target having a series of test pa... | 05/22/1979 |
| 4146311 | Automatic visual field mapping apparatus A device for automatically mapping the visual field of a subject includes a concave, generally hemispherical viewing screen, with a plurality of light-conducting fibers extending thereto from the convex side of the screen. The other ends of the light cond... | 03/27/1979 |
| 4070102 | Apparatus for sensory control of a person undergoing test A sensory control apparatus to determine the visual acuteness of persons tested. The apparatus has at least one optical device to view images of figures provided by a step-by-step parade means. The apparatus is operated by an electronic command module ope... | 01/24/1978 |
| 4063807 | Perimetric eye testing device A perimetric eye examination device is provided having light-emitting diodes for the respective light sources which are perceived during the eye examinations. These light-emitting diodes are controllable for their brightness, either in linear dependence o... | 12/20/1977 |
| 4053212 | Test disk for eye examination An exchangeable device providing test patterns for eye examinations is provided to be insertable into an eye examination instrument, such as a projector or an eyepiece instrument. This device includes a cassette containing a rotatable disk carrying differ... | 10/11/1977 |
| 4027954 | Eye-testing apparatus A device for testing eyes provided with a rotatable drum located within a light impermeable casing in which the drum carries a plurality of slides bearing characters positioned on the perimeter of the drum and illuminated by a lamp located within the drum... | 06/07/1977 |
| 4015899 | Eye test apparatus with physician routed patient input adjustment to variable optical elements Corrective optics having continuously variable spherical, astigmatic, and prismatic functions are placed in a light path between a viewing patient and a projected target. Typically, the target is projected by a projector preferably through focusing optics... | 04/05/1977 |
| 4012128 | Method and apparatus for determining visual latency Apparatus and methods for testing temporal resolution of vision in a human subject are disclosed in which a light source is repetitively energized to produce pairs of visual stimuli, and the time interval between two stimuli in each pair is varied so as t... | 03/15/1977 |
| 3970376 | Device for testing color vision The color vision of a subject to be tested is evaluated by the presentation of a series of test panels having different colors to the subject. Each pair of test panels has prescribed maximum emission values over established wavelength ranges and wavelengt... | 07/20/1976 |
| 3947099 | Solid state color anomaloscope Apparatus for evaluation a human subject's color vision response including light emmiting diodes providing luminance in the yellow and red and green color spectrums, means for controlling the individual luminescence of the red and green diodes in an inver... | 03/30/1976 |
| 3947098 | Light projector device, particularly for eyesight examination tests A light projector device for projecting eyesight examination tests onto a screen comprises a test disc and a mask disc mounted one in front of the other with their peripheral regions in the path of a light beam from a light projection unit. The discs are ... | 03/30/1976 |
| 3936162 | Night vision testing method and apparatus A subject whose vision is to be tested wears a face mask having an eyepiece in which is mounted a light-emitting diode connected to means for varying the light intensity of the diode in a time ordered sequence. The level of light intensity is also numeric... | 02/03/1976 |
| 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 |
| 3936164 | Instruments for measuring visual fields Instruments for measuring visual fields including a portable perimeter having a handle by which it can be held by the subject being tested. In a preferred embodiment, the perimeter includes a protractor which can be rotated clockwise-counterclockwise abou... | 02/03/1976 |
