Cornea shape measuring apparatus

Details Cornea shape measuring apparatus Cornea shape measuring apparatus

1989-08-01

1990-04-17

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351247, A61B 310

Patent

active

049174584

ABSTRACT:
A cornea shape measuring apparatus which is provided with first and second substantially ring-like index marks disposed at different positions in the direction of the optic axis and projected onto the cornea of an eye to be examined and in which the corneal reflection images of the first and second index marks are detected by a first position detector and the shape of the cornea is measured without depending on the working distance.

REFERENCES:
patent: 4159867 (1979-07-01), Achatz
patent: 4256385 (1981-03-01), Cohen et al.
patent: 4666269 (1987-05-01), Nakamura et al.
patent: 4692003 (1987-09-01), Adachi et al.

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