Apparatus and method to measure visual function under simulated

Details Apparatus and method to measure visual function under simulated Apparatus and method to measure visual function under simulated

1995-06-22

1997-01-07

Mai, Huy

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351246, A61B 302, A61B 300

Patent

active

055922473

ABSTRACT:
An apparatus and method for measuring visual function under simulated nighttime conditions where the pupil is large by maintaining extremely low ambient illumination when the test is performed in a darkened room, the apparatus including a test field defining a plurality of recognizable indicia of variable irradiance which appear on a black background having zero irradiance or which indicia are completely black and surrounded by a bright background of variable irradiance, the test field being either illuminated by projection or transilluminated, and a field stop having a plurality of apertures of progressive sizes which are placed in front of the eye of the person being tested to ascertain the true functional optical zone of the cornea.

REFERENCES:
patent: 2738701 (1956-03-01), Hudson, Jr.

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