Perimeter

Details Perimeter Perimeter

1990-07-10

1991-11-19

Dzierzynski, Paul M.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351211, 351224, A61B 302

Patent

active

050661175

ABSTRACT:
A perimeter has a predetermined index to be projected onto a fundus of an eye to be examined and an index projection imaging optical system which can form an intermediate image of the index in front of the eye. An optical system as being at least a part of the index-projection imaging optical system, is movable to displace the position of the index image on the fundus of the eye. The index-projection imaging optical system has an image forming section which moves the intermediate image in the direction of the optical axis.

REFERENCES:
patent: 4260227 (1981-04-01), Munnerlyn et al.
patent: 4279478 (1981-07-01), Matsumura

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