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Ophthalmological instrument

  • US 5,032,020 A
  • Filed: 12/22/1988
  • Issued: 07/16/1991
  • Est. Priority Date: 02/09/1988
  • Status: Expired due to Term
First Claim
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1. An ophthalmological instrument comprising, a corneal contact member (1) designed as a imaging optical component with a corneal contact surface (13) for contacting the cornea (II) of the eye (6),a pressure measuring device (19, 21, 23, 25, 26, 27) for determining intraocular pressure,said pressure measuring device (19, 21, 23, 25, 26, 27) including pressure responsive means (25, 32) arranged at said corneal contact surface (13) of said corneal contact member (1) in order to impress or applanate a part of the cornea (11) of the eye (6),said corneal contact surface (13) of said corneal contact member (1) having a concave shape approximately adapted to the shape of the eye (6), the concave shape of the corneal contact surface (13) has a rim, and said pressure measuring device (19, 21, 23, 25, 26, 27) for determining intraocular pressure includes a first pressure sensor (23) for measuring the pressure exerted by the cornea (11) of the eye on said pressure responsive means (25, 32), at least a second pressure sensor (27) arranged adjacent said rim of said concave shape corneal contact surface (13) for measuring the contact pressure of said contact member (1) against the eye (6), and an electronic evaluating circuit (28) calculating the difference of the electric signals from the first (23) and the second (27) sensor, or the difference between the signal of the first sensor (23) and the average value of the signals from the second sensors (27), wherein a display means (33, 39) is provided which indicates this difference directly and/or the eye pressure determined from this difference.

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