Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1995-11-13
1997-05-06
Dang, Hung X.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351205, A61B 310
Patent
active
056276133
ABSTRACT:
The invention provides an ophthalmological illumination device which produces a plurality of illumination types using a single light source. The device illuminates the examined eye without causing damage to the maculalutea of the retina. The device illuminates the examined eye through an object lens and includes a light source means for supplying illumination light and a light separating means for separating the illumination light. The light separating means separates the light into a first illumination light which is incident on the object lens in a direction parallel with the optical axis of the object lens and a second illumination light. A movable inclining means causes the second illumination light to be incident on the object lens in a direction parallel with the optical axis. The angle of the second illumination light incident on the examined eye changes relative to the optical axis in accordance with the movement of the movable inclining means.
REFERENCES:
patent: 4779968 (1988-10-01), Sander
patent: 4838679 (1989-06-01), Bille
patent: 5126877 (1992-06-01), Biber
patent: 5132837 (1992-07-01), Kitajima
Dang Hung X.
Nikon Corporation
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