Ophthalmic photographing apparatus having a displacement measure

Details Ophthalmic photographing apparatus having a displacement measure Ophthalmic photographing apparatus having a displacement measure

1992-03-13

1993-10-05

Lerner, Martin

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351206, 351207, 354 62, A61B 314

Patent

active

052509664

ABSTRACT:
An ophthalmic photographing apparatus comprises an illumination optical system for illuminating an eye to be tested, a viewing optical system having a variable magnification optical system for viewing the illuminated eye to be tested, and a photographing device detachably mounted on the viewing optical system. A position change of a predetermined part due to the change of magnification of the variable magnification optical system is measured to produce a signal representing the displacement. The signal representing the magnification of the variable magnification optical system is used to control an intensity of a flash light.

REFERENCES:
patent: 4756613 (1988-07-01), Okashita
patent: 4950068 (1990-08-01), Mizuta

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