Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1989-04-13
1990-08-28
Bovernick, Rodney B.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351211, 351206, 128691, A61B 310, A61B 314
Patent
active
049520504
ABSTRACT:
Disclosed is an ophthalomological diagnosis method and apparatus in which a blood vessel in the eye fundus is illuminated with a laser beam of a predetermined beam spot whose diameter is substantially equal to or smaller than that of the blood vessel in order to produce diffraction-plane speckles which are formed at a Fourier-transform plane by light scattered from the eye fundus. Boiling motion of the diffraction-plane speckle pattern thus produced is then detected through a multiple detection aperture pattern which is disposed at the Fourier-transform plane and comprised of a plurality of small apertures to obtain a speckle signal which is evaluated to measure velocity of the blood flowing through the blood vessel concerned. This arrangement makes it possible to detect the speckle signal without any effect of averaging the signal with an increase in intensity detected, thus enabling advantageous and successful measurement of the blood flow state in the eye fundus.
REFERENCES:
patent: 4402601 (1983-09-01), Riva
patent: 4423931 (1984-01-01), Shapiro
Aizu Yoshihisa
Ogino Kouji
Sugita Toshiaki
Adams Bruce L.
Bovernick Rodney B.
Kowa Company Ltd.
Wilks Van C.
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