Contrast chart device, contrast sensitivity measuring device...

Details Contrast chart device, contrast sensitivity measuring device... Contrast chart device, contrast sensitivity measuring device...

2002-02-07

2008-10-28

Stultz, Jessica T (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

C351S243000, C351S211000

Reexamination Certificate

active

07441900

ABSTRACT:
A contrast chart device of the present invention comprises a contrast target presenting part for presenting a contrast target for a contrast sensitivity test at prescribed timing; a pupil data measuring part for producing an image of an anterior ocular segment of a subject and measuring the diameter or area of a pupil region in the anterior ocular segment; and a measurement timing forming part for forming timing at which the pupil data measuring part performs measurement.

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