Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1987-02-19
1988-05-10
Corbin, John K.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351211, 351206, 128691, 356 285, A61B 310, A61B 502, G01P 336
Patent
active
047431075
ABSTRACT:
An ophthalmological diagnosis method and an apparatus for carrying out the method are disclosed. According to the method a region of the eye, e.g. the fundus, is illuminated with a laser beam of prescribed diameter to produce a laser speckle pattern formed by light scattered by blood cells within the tissue of the eye, movement of the laser speckle pattern is detected as fluctuation in the light intensity of the speckles at an observation point and a speckle signal corresponding to the detected movement is produced, the power spectrum distribution of the speckle signal is obtained, the power spectrum distribution configuration is evaluated from the results of a calculation of the mean frequency thereof and the blood flow state in the tissue is determined from the results of the evaluation. The apparatus for carrying out this method comprises a laser beam source, a laser beam optical system for guiding laser light from the laser beam source, adjusting it to a predetermined beam diameter and causing it to illuminate a region of eye tissue of predetermined area, means for measuring light scattered from the illuminated region of eye tissue and producing a signal corresponding to the result of the measurement, and means for processing the signal from the measuring means.
REFERENCES:
patent: 4311383 (1982-01-01), Ohtsubo
patent: 4346991 (1982-08-01), Gardner et al.
patent: 4402601 (1983-09-01), Riva
Aizu Yoshihisa
Ogino Kouji
Adams Bruce L.
Corbin John K.
Dzierzynski P. M.
Kowa Company Ltd.
Wilks Van C.
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