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Related Experiment Videos

Corneal indentation during ultrasonic pachometry.

O D Solomon1

  • 1Department of Ophthalmology, Case Western Reserve School of Medicine, Cleveland, Ohio, USA. info@eyeberspace.com

Cornea
|March 25, 1999
PubMed
Summary

Ultrasonic pachometry for measuring corneal thickness is not affected by probe indentation. This finding is crucial for accurate ophthalmic diagnostics and intraocular pressure assessment.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Medical Instrumentation

Background:

  • Accurate corneal thickness measurement is vital for ophthalmic diagnostics.
  • Corneal indentation during ultrasonic pachometry is a potential source of measurement error.
  • Understanding the impact of indentation is essential for reliable pachymetry.

Purpose of the Study:

  • To investigate the effect of corneal indentation by an ultrasonic probe on corneal thickness measurements.
  • To determine if varying indentation forces influence ultrasonic pachometry readings.

Main Methods:

  • An ultrasonic transducer was integrated with a Goldmann Applanation Tonometer.
  • Corneal thickness was measured in five human subjects at different tonometer tension settings (0, 10, 20, 40, 80).
  • Radio-frequency signals were captured and thicknesses digitally measured.

Main Results:

  • No significant trend of decreasing or increasing corneal thickness measurements was observed with increasing tonometer tension.
  • Corneal indentation did not introduce a systematic bias in the measurements.

Conclusions:

  • Corneal thickness measurements obtained via ultrasonic pachometry are not significantly affected by the indentation forces of the ultrasonic probe.
  • The findings support the reliability of ultrasonic pachometry for corneal assessment, even with probe contact.

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