Apparatus for measuring cornea shape

Details Apparatus for measuring cornea shape Apparatus for measuring cornea shape

1991-01-28

1993-05-18

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351247, A61B 310

Patent

active

052125076

ABSTRACT:
An apparatus for measuring a corneal shape includes a projecting device projecting a set of point sources, which are substantially on a same circle, onto a cornea. A detecting optical system defects the positions of the point sources projected onto the cornea by the projecting device. A selecting device selects a plurality of the corneal reflection images detected by the detecting optical system, each of which consists of at least 3 points forming a part of the circle. A calculating device obtains a part of the corneal shape by presuming an ellipse containing the points of each selected group in the corneal reflection images. A displaying device displays the corneal shape based on the results obtained by the calculating device.

REFERENCES:
patent: 4312574 (1982-01-01), Wilms
patent: 4660946 (1987-04-01), Nakamura et al.

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