Eye fundus camera having ring slit mask in illuminating system

Details Eye fundus camera having ring slit mask in illuminating system Eye fundus camera having ring slit mask in illuminating system

1981-03-18

1983-12-27

Corbin, John K.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

354 62, 351214, A61B 314, A61B 310, G03B 700

Patent

active

044227361

ABSTRACT:
An eye fundus camera including an illuminating system having two apertured masks. One of the masks has a pair of coaxial ring-shaped slits and located with respect to the objective lens in conjugate with the cornea of the patient's eye, whereas the other has a ring-shaped slit in conjugate with the iris of the eye. The arrangement is effective to provide an increased field angle with a substantially uniform illumination without having adverse effects of harmful reflections.

REFERENCES:
patent: 3851954 (1974-12-01), Kato et al.
patent: 4102563 (1978-07-01), Matsumura et al.

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