Ophthalmological diagnosis apparatus

Details Ophthalmological diagnosis apparatus Ophthalmological diagnosis apparatus

1988-03-29

1989-07-18

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

048488976

ABSTRACT:
An ophthalmological diagnosis apparatus is disclosed that has an optical spatial frequency filter, a double diffraction optical system whereby an eye fundus image formed at a first image plane that is conjugate with the eye fundus is again formed at a second image plane, a magnifying optical system for expanding the eye fundus image formed on the second image plane, and a detecting aperture for detecting movement of laser speckles formed at the image plane of magnifying optical system as fluctuations in the intensity of the speckle light. Advantages of the apparatus include the ease with which a single, specific blood vessel can be selected; unnecessary light components can be filtered out, improving the S/N ratio of the speckle light detection; the optical system does not need to be high-precision; good operability; and measurement results that are much more reliable and reproducible.

REFERENCES:
patent: 4423931 (1984-01-01), Shapiro

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