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Ocular tonometer for estimation of intraocular pressure using free-falling ball

  • US 5,197,473 A
  • Filed: 08/20/1992
  • Issued: 03/30/1993
  • Est. Priority Date: 06/29/1990
  • Status: Expired due to Fees
First Claim
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1. An ocular tonometer, comprising in combination an oblong hollow tubular housing having a first end and a second end, which are essentially opposite to each other;

  • a ball disposed within said housing whose diameter is smaller than the inside diameter of the tubular housing to permit said ball to free fall inside said tubular housing along a free falling pathway from its first end towards its second end;

    a holder means situated at the first end of the oblong housing for preventing the ball from falling and for releasing said ball for its free falling inside the tubular housing; and

    an indicator means for measuring the amount of ball rebound after its free falling onto an eyelid covering a cornea, of a patient'"'"'s eye as a result of reaction thereof, wherein said indicator means comprises a graduated scale provided on the oblong housing and is subdivided into three portions along its length, said portions corresponding to the amounts of ball rebound that are characteristic of a reduced intraocular pressure, a normal pressure, and an increased pressure.

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