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Related Experiment Videos

Variability of ultrasonic pachometry.

A Gordon1, E A Boggess, J F Molinari

  • 1School of Optometry, Medical Center, University of Alabama, Birmingham.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|March 1, 1990
PubMed
Summary

Ultrasonic pachometry using the Humphrey model 580 shows good repeatability for measuring corneal thickness. This device offers a simple and objective method for routine clinical monitoring of corneal changes.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Medical Devices

Background:

  • Corneal thickness is a critical parameter in ophthalmology.
  • Accurate and repeatable measurement of corneal thickness is essential for clinical diagnosis and management.
  • Ultrasonic pachometry offers a non-invasive method for assessing corneal dimensions.

Purpose of the Study:

  • To evaluate the intraobserver, interobserver, and intersession variability of the Humphrey model 580 ultrasonic pachometer.
  • To determine the reliability and reproducibility of corneal thickness measurements using this device.
  • To assess the suitability of ultrasonic pachometry for routine clinical use.

Main Methods:

  • The Humphrey model 580 ultrasonic pachometer was used for measurements.

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  • Intraobserver variability was assessed in 20 eyes from 10 subjects.
  • Interobserver and intersession variability were assessed in 42 eyes from 21 subjects.
  • Multiple analysis of variance (MANOVA) was employed for statistical analysis.

    • Main Results:

    • No statistically significant differences were found between observers or between right and left eyes.
    • A marginally significant intersession effect was observed, with slightly greater corneal thicknesses measured in the afternoon.
    • Intraobserver variability averaged 6 microns.
    • Interobserver variability was approximately 11 microns.
    • Intersession variability was approximately 14 microns.

    Conclusions:

    • The Humphrey model 580 ultrasonic pachometer demonstrates acceptable intraobserver, interobserver, and intersession variability.
    • The device's simplicity, objectivity, and repeatability support its routine use in clinical practice.
    • Ultrasonic pachometry can facilitate routine monitoring of corneal thickness changes.