Ophthalmic apparatus for measuring refractive characteristic of

Details Ophthalmic apparatus for measuring refractive characteristic of Ophthalmic apparatus for measuring refractive characteristic of

1994-07-25

1996-03-19

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351211, 351247, A61B 310

Patent

active

055006973

ABSTRACT:
An ophthalmic apparatus measures characteristics of an eye using a projection mechanism that projects a target onto a fundus of the eye in a plurality of meridional directions in a cornea of the eye so as to substantially cover all over the cornea. A detection mechanism detects a position of the target image projected onto the fundus. A processor calculates refractive power values in the meridional directions based on the positions detected by the detection mechanism. The results are graphically displayed to permit an operator to quickly understand and interpret the results at a glance.

REFERENCES:
patent: 4859051 (1989-08-01), Fukuma et al.
patent: 5214456 (1993-05-01), Gersten
patent: 5309186 (1994-05-01), Mizuno
patent: 5357294 (1994-10-01), Shimizu et al.

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