Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1998-05-08
1999-10-19
Manuel, George
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
G03B 1700
Patent
active
059697920
ABSTRACT:
A process for testing vision sensitivity from a target is set forth. Specifically, I illuminate the vision sensitivity chart with only indirect light and in the total absence of direct light. In the preferred embodiment, the contrast sensitivity chart is placed in an enclosure and provided with only indirect illumination of a desired intensity. The indirect illumination is such that all light illuminating the vision sensitivity target first indirectly rebounds from a surface and only then is incident upon the vision sensitivity target. At the same time, light rays on the target from this illumination cannot directly rebound into the direct viewer of the subject being tested. With an enclosure having this characteristic, paired viewing apertures are provided and spaced from the eye to provide the eye with a clear the contrast sensitivity chart. Offset from the eye and at a solid angle emulating a real life night driving light source, such as a headlight, light having a direct glare is introduced to the eye. Thereafter, for various indirect light levels on the contrast sensitivity chart, measurements are made with and without glare from the glare sources being present. The test results have been found by me to reliably predict test results on my prior art simulator enabling a simple clinical analog to take the place of what heretofore was much more elaborate testing.
REFERENCES:
patent: 4800404 (1989-01-01), Ginsburg et al.
patent: 5471262 (1995-11-01), Trokel
patent: 5550602 (1996-08-01), Braeuning
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