Corneal shape measuring apparatus

Details Corneal shape measuring apparatus Corneal shape measuring apparatus

1992-05-01

1994-04-05

Arnold, Bruce Y.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351211, 351216, 351217, 351220, A61B 310

Patent

active

053009657

ABSTRACT:
This invention provides a corneal shape measuring apparatus that can correctly measure the shape of the cornea of a subject's eye from an image of a target reflected by the cornea even if the optic axis of a hand-held indicator is inclined with respect to the optic axis of the measuring system when measurements are made. A computing control circuit computes the inclination with respect to the measuring optic axis of an indicator plate from the shape of a guide hole in the indicator plate which had previously been input and the shape of the image of the guide hole, and corrects the image of the indicator reflected by the cornea of the subject's eye based on this inclination.

REFERENCES:
patent: 4256385 (1981-03-01), Cohen et al.
patent: 4426141 (1984-01-01), Holcomb
patent: 4569576 (1986-02-01), Karpov et al.
patent: 4597648 (1986-07-01), Feldon et al.
patent: 4685140 (1987-08-01), Mount, II
patent: 4710003 (1987-12-01), Masuda et al.
patent: 4772115 (1988-09-01), Gersten et al.
patent: 4779973 (1988-10-01), Miller et al.
patent: 4863260 (1989-09-01), Gersten et al.
patent: 5110200 (1992-05-01), Snook

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