Mapping of corneal topography with display of pupil perimeter

Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type

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351204, 351206, 351246, A61B 310

Patent

active

052144569

ABSTRACT:
Method for accurately displaying the location of the pupil perimeter on a corneal topography map such as is disclosed in the prior art Gersten et al., U.S. Pat. No. 4,863,260. In the process of deriving such topographic information, the process disclosed in that patent obtained a two-dimensional video image of the cornea. In the method of the present invention, the background illumination of the video image is sampled and the video signal is corrected for the effects of camera distortions, artifacts, and specular glare. The corrected data is analyzed and the point at which the greatest rate of change in background illumination occurs is determined to be a point on the periphery of the pupil. The peripheral points so determined are then displayed in superposition to the corneal topographic map thereby indicating the pupil outline.

REFERENCES:
patent: 4863260 (1989-09-01), Gersten et al.
patent: 4950069 (1990-08-01), Hutchinson

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