Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1994-03-16
1995-06-06
Sikes, William L.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351221, 128745, A61B 314
Patent
active
054226902
ABSTRACT:
A fitness impairment tester implements a self-administered screening test to determine whether a subject is physically impaired. The tester is fully automated to respond to the entering of a subject's personal identification on a keypad. By superposing two different colored lights as viewed through an eyepiece, the subject aligns his or her pupil on the optical axis of pupil imaging optics which focuses an image of the subject's pupil on an image plane. The tester automatically recognizes this condition and audibly signals the subject that the test is about to begin. Light stimuli are provided to cause the pupil to change size and the eye to move. Pupil diameter measurements are made of the image of the subject's pupil in response to on axis light stimuli. Eye tracking of the subject's eye in response to moving light stimuli provide a measure of eye movements. The data acquired by measuring pupil diameter and saccadic movements of the subject's eye as a function of time are compared with baseline data for the subject stored in a database, and an output indicative of a deviation of said current measurements from said baseline data is provided.
REFERENCES:
patent: 4850691 (1989-07-01), Gardner et al.
patent: 4854329 (1989-08-01), Walruff
patent: 5196872 (1993-03-01), Beesmer
Cornsweet Tom N.
Rafal Marc D.
Rothberg Michael
Mai Huy
Pulse Medical Instruments, Inc.
Sikes William L.
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