Visual target apparatus

Details Visual target apparatus Visual target apparatus

1992-02-27

1993-08-17

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351237, A61B 302

Patent

active

052373517

ABSTRACT:
An apparatus for producing a figure as a visual image target visually recognizable by a patient to be examined, generating an image as a visual target from an image memory and displaying the visual target, and changing the size of the visual target in accordance with a change in diopter of the visual target.

REFERENCES:
patent: 4252420 (1981-02-01), Kohayakawa
patent: 4293198 (1981-10-01), Kohayakawa et al.
patent: 4697895 (1987-10-01), Sekiguchi et al.
patent: 4820037 (1989-04-01), Kohayakawa et al.
patent: 4953968 (1990-09-01), Sherwin

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