Eye fundus observing optical system

Details Eye fundus observing optical system Eye fundus observing optical system

1978-12-28

1981-02-03

Sacher, Paul A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

350 54, A61B 310

Patent

active

042485061

ABSTRACT:
An eye fundus observing optical system which can perform the diopter correction of the inner focus type by the construction that a relay lens system for forming a second fundus image from a first fundus image formed by an objective lens is constituted by two first and second positive lenses, and the front focus of the first lens is coincident with the back focus of the objective lens, and the second lens is movable in the direction of the optic axis. Further, in accordance with the diopter of the eye to be examined, the second lens is moved in the direction of the optic axis.

REFERENCES:
patent: 3089398 (1963-05-01), Wilms
patent: 3259039 (1966-07-01), Okajima
patent: 3925793 (1975-12-01), Matsumura et al.
patent: 4068932 (1978-01-01), Ohta et al.
patent: 4102563 (1978-07-01), Matsumura et al.

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