Ophthalmic apparatus

Details Ophthalmic apparatus Ophthalmic apparatus

1987-04-02

1989-03-14

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351206, 354 62, A61B 314

Patent

active

048120332

ABSTRACT:
An ophthalmic apparatus has an objective optical system opposed to an eye to be examined. First and second photodetectors are provided on the substantially conjugate plane of the iris of the eye to be examined with respect to the objective optical system when the operating distance to the eye to be examined is appropriate. The photodetectors detect the image of the iris of the eye to be examined and the image of the pupil of the eye to be examined, respectively, and a detecting device compares the output of the first and second photodectors and detects the state of alignment with the eye to be examined.

REFERENCES:
patent: 4511227 (1985-04-01), Nunokawa et al.
patent: 4678297 (1987-07-01), Ishikawa et al.

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