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Accurate three dimensional eye tracker

  • US 4,373,787 A
  • Filed: 11/13/1980
  • Issued: 02/15/1983
  • Est. Priority Date: 02/28/1979
  • Status: Expired due to Term
First Claim
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1. A three dimensional eye tracker for measuring, as a function of time, the point in three dimensional space on which the eye is fixed, includinga two dimensional double Purkinje image eye tracker portion for measuring movement of the eye in rotation and translation, said eye tracker incorporating means for forming and directing a beam containing images of first and fourth Purkinje images, measuring means responsive to said first and fourth Purkinje images to generate output signals indicative of eye rotation and translation, optical focusing and positioning means positioned in the path of said images and responsive to said output signals to maintain the position of the first Purkinje image relative to the said eye and focus images from the eye, andan automatic optometer portion for measuring the refractive power of the eye, having beam generating means for forming an image at the eye and refractive power measuring means responsive to an image containing beam from the eye, at least a portion of said optometer beam path traversing a path including at least a portion of the said optical focusing and positioning means, whereby images formed by the said optometer portion are maintained in focus and stabilized in position.

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