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Related Experiment Videos

A miniaturized applanation tonometer.

J G Ma1, D Z Xu

  • 1Anhui Institute of Mechanical and Electrical Engineering, Wuhu, P.R.C. dfmountain@163.net

IEEE Transactions on Bio-Medical Engineering
|August 4, 1999
PubMed
Summary
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A new miniaturized hand-held tonometer uses a cone prism probe to measure intraocular pressure. Its self-weight provides the applanation force, with optoelectronic signals monitoring corneal flattening for clinical accuracy.

Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Medical Devices

Background:

  • Accurate intraocular pressure (IOP) measurement is crucial for diagnosing and managing glaucoma.
  • Existing tonometry methods can be complex, bulky, or require specialized training.
  • There is a need for portable, user-friendly devices for IOP assessment.

Purpose of the Study:

  • To introduce a novel miniaturized hand-held applanation tonometer.
  • To evaluate the feasibility and preliminary accuracy of this new device for IOP measurement.

Main Methods:

  • A miniaturized hand-held applanation tonometer was developed.
  • A specialized cone prism served as the applanation probe, utilizing its self-weight as the applanation force.
  • Optoelectronic signals monitored the applanation area on the ocular cornea.

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Main Results:

  • The device is miniaturized and hand-held, enhancing portability.
  • Preliminary clinical tests showed good patient acceptance.
  • The tonometer demonstrated accuracy that meets clinical requirements for IOP measurement.

Conclusions:

  • The developed miniaturized applanation tonometer shows promise as a portable and accurate device.
  • Its design, relying on self-weight for applanation force, simplifies operation.
  • Further clinical validation is warranted to confirm its utility in routine practice.