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Geometric optical power measurement device

  • US 9,072,462 B2
  • Filed: 03/12/2013
  • Issued: 07/07/2015
  • Est. Priority Date: 09/27/2012
  • Status: Active Grant
First Claim
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1. An ophthalmic optical power measurement device comprising:

  • a light source configured to direct an input beam of light into the eye of a patient;

    an aperture configured to receive an output beam of light from the eye, the output beam of light comprising light from the input beam that scatters from a location on the retina of the eye and exits through the pupil of the eye;

    a detector configured to receive the output beam after it has passed through the aperture; and

    a processor configured to determine the size of a spot created by the output beam on the detector, and to determine the optical power of the eye based upon a relationship between the size of the spot, the size of the aperture, and the distance between the aperture and the detector,wherein the device has substantially zero optical power from the aperture to the detector.

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