Illumination optical system of an ophthalmologic instrument

Details Illumination optical system of an ophthalmologic instrument Illumination optical system of an ophthalmologic instrument

1994-08-18

1995-07-11

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351206, 351221, A61B 310

Patent

active

054325692

ABSTRACT:
An illumination optical system of an ophthalmologic instrument capable of avoiding the decrease of illumination efficiency without narrowing the width of a ring image formed on a pupil. The illumination optical system includes an illumination light source; a ring aperture plate for forming a ring slit image, with which a fundus of a subject's eye is illuminated, on the pupil of the eye; a conical prism disposed between the ring aperture plate and the illumination light source; and a scattering member disposed at a point substantially conjugate with the pupil.

REFERENCES:
patent: 4770523 (1988-09-01), Yamada

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