Eye refractive power measuring apparatus

Details Eye refractive power measuring apparatus Eye refractive power measuring apparatus

1984-12-17

1988-07-05

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

A61B 310

Patent

active

047550414

ABSTRACT:
An eye refractive power measuring apparatus having a unit for projecting a plurality of index images onto the fundus of an eye to be examined, a unit for detecting the eye fundus reflected light beams of the index images correspondingly to each measuring meridian direction, a unit for operating the refractive power of the eye on the basis of the output of the detecting means, a unit for moving a fixation target for fixing the eye to be examined thereto or the projection system thereof in the direction of the optic axis, and a unit for controlling the movement speed of the fixation target or the projection system thereof on the basis of the degree of variation in the result of the measurement of the operated refractive power of the eye which results from the movement.

REFERENCES:
patent: 4376573 (1983-03-01), Matsumura
patent: 4408847 (1983-10-01), Wada
patent: 4421391 (1983-12-01), Matsumura
patent: 4431278 (1984-02-01), Nohda

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