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Related Experiment Videos

Nonoptical definition of applanation surface.

J Draeger1, E Rumberger, B Hechler

  • 1Department of Ophthalmology, University of Hamburg, FRG.

Ophthalmic Research
|January 1, 1987
PubMed
Summary

New applanation tonometers were developed using the Imbert-Fick law and Goldmann

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Optometry

Background:

  • Goldmann applanation tonometry is the standard for intraocular pressure measurement.
  • Existing tonometers rely on the Imbert-Fick law.
  • Biometric calibration is a factor in tonometer accuracy.

Purpose of the Study:

  • To design and test new applanation tonometers.
  • To evaluate electronic area assessment devices for tonometry.
  • To maintain the established 3.06 mm applanation diameter.

Main Methods:

  • Designed new applanation tonometers based on Imbert-Fick law and Goldmann principles.
  • Utilized an applanation diameter of 3.06 mm.
  • Employed three distinct electronic recording devices for area assessment: optical, capacitance, and digital line sensors.
  • Conducted initial calibration experiments.

Main Results:

  • New applanation tonometers were successfully designed.
  • Three types of electronic sensors (optical, capacitance, digital line) were evaluated for area assessment.
  • Initial calibration experiments were performed with these new devices.

Conclusions:

  • New applanation tonometers can be designed without altering the standard applanation diameter.
  • Electronic sensors offer alternative methods for area assessment in tonometry.
  • Further calibration and validation are necessary for clinical application.

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