Ophthalmic instrument having working distance detecting means

Details Ophthalmic instrument having working distance detecting means Ophthalmic instrument having working distance detecting means

1980-06-25

1984-03-13

Corbin, John K.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

354 62, A61B 314, G03B 2900

Patent

active

044363893

ABSTRACT:
An ophthalmic instrument such as an eye fundus camera including an illuminating system which projects an illuminating light through a ring-shaped aperture to a patient's eye. There is provided a working distance detecting device which includes a light receiving section provided around the objective lens. A portion of the illuminating light as reflected at the cornea of the patient's eye is received by the light receiving section to determine a correct working distance.

REFERENCES:
patent: 4219258 (1980-08-01), Araki et al.
patent: 4257687 (1981-03-01), Kohayakawa

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