Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1996-06-27
1997-12-02
Mai, Huy
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351239, 351246, A61B 302, A61B 300
Patent
active
056941994
ABSTRACT:
An improved visual performance tester is provided which measures and stores very precise information concerning the visual sensitivity of a human eye, by use of a series of contrasting images on a computer monitor screen under a controlled-lighting environment. The tester measures the time it takes for a human patient to give the answers required by the test, thereby providing more accurate information than previously available in conventional vision testing systems. Various charts having different spatial frequencies (i.e., different sizes of bands inside a circle), different band inclinations, and different contrast characteristics are periodically displayed on the computer monitor, while the patient presses buttons (or areas) on the monitor screen to indicate his or her ability to perceive the chart images. By gradually and randomly decreasing the contrast, and/or increasing the spatial frequency, the tester can determine the patient's critical vision threshold. The test conditions are normalized in order to better compare one test result to another so that a database of "standard" human eye vision data can be accumulated for future use. After a database is established for a particular testing system, the results for an individual patient can automatically be compared to "normal" results, and the testing system's overall results in diagnosis of vision problems are superior in accuracy, precision, and range of parameters automatically measured and evaluated.
REFERENCES:
patent: 5206671 (1993-04-01), Eydelman et al.
patent: 5530492 (1996-06-01), Ron
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