Visual axis detecor having a high sensitivity to a light from an

Details Visual axis detecor having a high sensitivity to a light from an Visual axis detecor having a high sensitivity to a light from an

1991-12-30

1994-03-29

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351200, 351205, A61B 310

Patent

active

052989275

ABSTRACT:
A visual axis detector includes an illumination device for illuminating an eye; an optical device for guiding light from the eye; the light being in a form of a light intensity distribution having first and second portions; a photo-sensing device, having an array of photo-cells, for receiving the light guided by the optical device, and for generating an electrical signal corresponding to the light intensity distribution; an arithmetic operation device for calculating a visual axis of the eye in accordance with the electrical signal generated by the photo-sensing device; and a control device for controlling the photo-sensing device to have different sensitivities for sensing the first and second portions of the light intensity distribution.

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