Linear array eye tracker

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

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A61B 300

Patent

active

059661976

ABSTRACT:
Improved devices, systems, and methods for sensing and tracking the position of an eye make use of the contrast between the sclera and iris to derive eye position. In many embodiments, linear photodetectors extend from the iris to the sclera. The eye is positioned between a pair of such linear photodetectors, and movement of the eye from one linear detector toward the other linear detector changes the relative amounts of light striking each linear detector. These pairs of linear photodetectors can accurately sense and measure one-dimensional positioning error and provide feedback to a one-dimensional positioning apparatus, resulting in a simple, highly linear system capable of accurate position tracking.

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Young and Sheena, Behavior Research Methods and Instrumentation (1975) vol. 7, No. 5, Survey of eye movement recording methods, pp. 401-429.

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