Ophthalmological measurement apparatus having sensitivity error

Details Ophthalmological measurement apparatus having sensitivity error Ophthalmological measurement apparatus having sensitivity error

1991-07-16

1992-08-25

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351205, 128745, A61B 310

Patent

active

051413043

ABSTRACT:
An ophthalmological measurement apparatus which projects a laser beam into a subject's eye and conducts a prescribed ophthalmological measurement based on the state of laser light scattering in the eye comprises a laser beam projection system for converging a laser beam from a laser source at a measurement point in the eye, a light receiving system for receiving scattered laser light from the interior of the eye by a photosensor means thereof and detecting the light scattering state inside the eye from the measured number of pulses output by the photosensor means. In this arrangement, the sensitivity of the photosensor means is measured, and the result of the light scattering state detection is automatically corrected according to the measured sensitivity of the photosensor means so that accurate ophthalmological measurement results can be obtained notwithstanding aging of the photosensor means or changes in its environmental conditions.

REFERENCES:
patent: 4957360 (1990-09-01), Kakizawa

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