Keratometer

Details Keratometer Keratometer

1992-12-21

1994-06-28

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351211, 351221, A61B 310

Patent

active

053251342

ABSTRACT:
A keratometer in which at least three point sources of light in an area exceeding a semicircular area are projected onto the cornea of an eye to be examined and the center of an ellipse is specified on the basis of the position information of all the three cornea-reflected images and the shape of an ellipse linking the positions of the reflected images when the point sources of light exist on the circumference of the same circle is found to thereby measure the shape of the cornea of the eye to be examined.

REFERENCES:
patent: 4572628 (1986-02-01), Nohda
patent: 4597648 (1986-07-01), Feldon et al.

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