Self-calibrating vision test apparatus

Details Self-calibrating vision test apparatus Self-calibrating vision test apparatus

1989-10-13

1992-01-07

Dzierzynski, Paul M.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351203, A61B 302

Patent

active

050784862

ABSTRACT:
A vision test apparatus illuminated by internal light source generating a constant, predetermined light intensity in the vicinity of the eye chart. The unit employs at least one photocell to monitor the light intensity near the eye chart and thereby adjust the amount of light generated by the light source to provide a constant level of illumination near the eye chart.

REFERENCES:
patent: 4415921 (1983-11-01), Mulvanny et al.
patent: 4514727 (1985-04-01), Van Antwerp
The Journal of the American Academy of Ophthalmogy, Aug. 24, 1989, p. 99.

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