Apparatus for measuring a cornea shape

Details Apparatus for measuring a cornea shape Apparatus for measuring a cornea shape

1994-05-20

1995-11-14

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351211, A61B 310

Patent

active

054671507

ABSTRACT:
An apparatus for measuring a cornea shape is capable of arbitrarily changing the diameter of ring illumination projected onto the cornea. The apparatus includes a light source for supplying a beam of light, a scanner system for scanning the beam of light from the light source and forming a light spot describing a circular locus on the surface of the cornea, and a device for observing therethrough the shape of the cornea on the basis of the locus described by the beam of light reflected by the cornea. The scanner system includes a reflecting mirror having a zonal reflecting surface disposed around the cornea, and a light deflector for directing the beam of light from the light source to the zonal reflecting surface.

REFERENCES:
patent: 4999009 (1991-03-01), Matsumura
patent: 5080477 (1992-01-01), Adachi
patent: 5243367 (1993-09-01), Spellitz

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