Eye fundus observing and photographing optical system

Details Eye fundus observing and photographing optical system Eye fundus observing and photographing optical system

1980-12-08

1984-01-03

Rosenberger, R. A.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351221, A61B 314, G03B 2900

Patent

active

044239327

ABSTRACT:
An eye fundus observing and photographing optical system has an objective lens including a main positive lens component and at least one positive lens component provided at that side of the main positive lens component which is adjacent to an eye to be examined, and an illuminating optical system including an apertured mirror disposed obliquely with respect to the optical axis of the objective lens to supply an illuminating light to the fundus of the eye through the objective lens. The reflected image position of the opening portion of the apertured mirror by the lens surface of said at least one positive lens component which is adjacent to the eye is made substantially coincident with a first position whereat the reflected image of the opening portion of the apertured mirror by the lens surface of the main positive lens component which is adjacent to the eye is formed, and the reflected image position of the opening portion of the apertured mirror by the lens surface of said at least one positive lens component which is adjacent to the apertured mirror is made substantially coincident with a second position which is more adjacent to the eye than said first position.

REFERENCES:
patent: 4162827 (1979-07-01), Ito
patent: 4176920 (1979-12-01), Ito
patent: 4322137 (1982-03-01), Nohda

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