Working position locating means for ophthalmologic apparatus

Details Working position locating means for ophthalmologic apparatus Working position locating means for ophthalmologic apparatus

1981-11-04

1983-09-20

Corbin, John K.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

354 62, G03B 2900, A61B 314

Patent

active

044052154

ABSTRACT:
A working position locating device for an ophthalmologic apparatus in which the projected image of a ring slit aperture is offset from the projecting optical axis when the position of the apparatus is being changed so that the ring slit image be seen on the focal plane of the observation optical system, whereby the proper working position of the objective lens relative to the eye can be grasped from the position of the ring slit image.

REFERENCES:
patent: 4196979 (1980-04-01), Kohayakawa et al.

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