Eye refractive power measurement apparatus

Details Eye refractive power measurement apparatus Eye refractive power measurement apparatus

2004-12-17

2008-08-26

Mack, Ricky L (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

C351S200000, C351S211000

Reexamination Certificate

active

07416301

ABSTRACT:
An eye refractive power measurement apparatus capable of measuring even an eye with a small pupil diameter with accuracy and stability. The apparatus has a measurement optical system including a projection optical system, having a light source, for projecting spot-shaped measurement light onto a fundus and a photo-receiving optical system, having a photodetector, for photo-receiving the measurement light reflected from the fundus via a peripheral pupillary portion, a calculation part which obtains the eye reflective power based on an output from the photodetector, alight deflection member, an arrangement of which in the measurement optical system being prevented from having a positional relationship optically approximately conjugate with a pupil, and a rotation unit which rotates the light deflection member about a measurement optical axis of the measurement optical system.

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patent: 2002-17676 (2002-01-01), None

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