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Non-contact tonometer

  • US 5,076,274 A
  • Filed: 09/04/1990
  • Issued: 12/31/1991
  • Est. Priority Date: 02/18/1987
  • Status: Expired due to Term
First Claim
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1. A non-contact tonometer comprising:

  • a pressurizing system, a deformation detection system, and a calculation system, wherein;

    said pressurizing system includes;

    fluid pressurizing chamber means for providing pressurized fluid; and

    nozzle means for applying the pressurized fluid to deform a cornea of an eye to be examined, said nozzle means being coupled to said fluid pressurizing chamber means and adapted to be positioned opposite to the eye along a pressurization axis;

    said deformation detection system includes;

    light projection means for projecting a pulsed light beam to the cornea,light receiving means for receiving a light beam reflected by the cornea during the deformation of the cornea; and

    deformation speed detecting means for detecting the moving speed of the corneal surface being deformed in the direction of the pressurization axis on the basis of a frequency deviation between pulsed light beam projected to the cornea and the pulsed light beam reflected by the cornea;

    said calculation system includes;

    calculation means for calculating the eye pressure in accordance with the time integration of an output from said deformation speed detecting means.

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