Ophthalmic instrument having focus detecting mark projecting mea

Details Ophthalmic instrument having focus detecting mark projecting mea Ophthalmic instrument having focus detecting mark projecting mea

1984-02-22

1987-06-16

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351206, 351208, A61B 310

Patent

active

046732640

ABSTRACT:
An eye fundus camera having an automated focus control system which includes a mark projecting system for projecting a focus detecting mark to the retina of a patient's eye to produce a mark image and a photoelectric system for detecting the mark image to judge the focus condition. The photoelectric system produces electric signals which are compared with a threshold level signal to produce mark image signals. In order to ensure an accuracy of detection of the mark image, the threshold level can be changed when it is judged as inappropriate.

REFERENCES:
patent: 4293198 (1981-10-01), Kohaykawa et al.
patent: 4400070 (1983-08-01), Isono et al.

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