Ophthalmic apparatus capable of measuring the shape of a cornea

Details Ophthalmic apparatus capable of measuring the shape of a cornea Ophthalmic apparatus capable of measuring the shape of a cornea

1992-09-16

1994-04-12

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351211, 351247, A61B 310

Patent

active

053029798

ABSTRACT:
An ophthalmic apparatus includes a first index mark provided as an index mark for measuring the shape of a cornea substantially on the optic axis, a second index mark provided around the optic axis, and a calculator for calculating the shape of the cornea based on the position information of the cornea-reflected image of the first and second index marks.

REFERENCES:
patent: 4660946 (1987-04-01), Nakamura et al.
patent: 4666269 (1987-05-01), Nakamura et al.
patent: 4704012 (1987-11-01), Kohayakawa et al.
patent: 4710003 (1987-12-01), Masuda et al.
patent: 4764006 (1988-08-01), Hamano et al.
patent: 4796989 (1989-01-01), Fukuma et al.
patent: 4859051 (1989-08-01), Fukuma et al.

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