Eye refractive power measurement apparatus

Details Eye refractive power measurement apparatus Eye refractive power measurement apparatus

2008-01-08

2008-01-08

Dang, Hung Xuan (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

C351S206000, C351S209000, C351S212000, C351S221000

Reexamination Certificate

active

07316480

ABSTRACT:
An eye refractive power measurement apparatus which is capable of measuring even an eye with a small pupil diameter and measuring a normal eye with a large enough pupil diameter with accuracy and stability. The apparatus includes a measurement optical system for photo-receiving measurement light from a fundus via a ring-shaped aperture arranged at an approximately conjugate position with a pupil by using a photodetector, a changing device for changing a size of the ring-shaped aperture on a pupillary surface to a size different in both inside diameter and outside diameter, and a calculation device for calculating the eye refractive power based on a photo-receiving result obtained by the photodetector.

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patent: WO 99/66828 (1999-12-01), None

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