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Method for evaluation of length of focus of the eye

  • US 5,576,780 A
  • Filed: 06/06/1995
  • Issued: 11/19/1996
  • Est. Priority Date: 05/26/1992
  • Status: Expired due to Fees
First Claim
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1. In an interactive virtual reality imaging system, a process for determining length of focus of an eye of a system user for adapting focus of an image generated by the imaging system, wherein said eye has a lens, a cornea and a retina, the process comprising:

  • identifying an optical path to the retina of said eye;

    projecting a first image along said optical path to the retina of said eye, said first image being focused at a first focal point along said optical path beyond the retina of said eye;

    detecting said first image from said optical path reflected from the retina of said eye and generating a first signal proportional to an intensity of said first image;

    projecting a second image along said optical path to the retina of said eye, said second image being focused at a second focal point along said optical path in front of the retina of said eye;

    detecting said second image from said optical path reflected from the retina of the eye and generating a second signal proportional to an intensity of said second image;

    comparing said first and second signals for indicating a relative intensity of said first and second images to determine an accommodation of said eye to provide the system user'"'"'s length of focus; and

    adjusting the focus of the image to correspond to the user'"'"'s length of focus.

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