Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1989-06-30
1992-05-05
Dzierzynski, Paul M.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351221, A61B 310
Patent
active
051102005
ABSTRACT:
A Keratometer for ascertaining the shape of the corneal surface of the eye comprises a television camera with associated processing circuitry. The television camera receives a reflection of a target such as placido's disc from the surface of the cornea. The television image of the reflection of the placido disc from the corneal surface is subjected to digital analysis after treatment in an edge detector. The edge detector reduces the number of data points that must be processed to define the radius of each ring in the reflected placido disc image. The resultant data are processed to derive surface contour and to provide a display in tabular, graphic or pictorial form of the contour data so generated.
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Dzierzynski Paul M.
Heim Michael F.
Technitex, Inc.
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