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Ophthalmic instrument having Hartmann wavefront sensor with extended source

  • US 6,595,642 B2
  • Filed: 08/31/2001
  • Issued: 07/22/2003
  • Est. Priority Date: 08/31/2001
  • Status: Expired due to Fees
First Claim
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1. An ophthalmic instrument comprising:

  • an extended source producing light that is formed as an image on the retina of a human eye and reflected from said human eye to produce retinal reflections derived from said extended source; and

    a wavefront sensor for estimating aberrations in said retinal reflections, wherein said wavefront sensor comprises;

    a plurality of subapertures that form a plurality of images of the extended source from said retinal reflections;

    an imaging device that captures said plurality of images and outputs image data representing said images; and

    an image processing computer that generates an estimate of the gradient field of said retinal reflections by applying image correlation techniques in the digital domain to said image data.

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