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Related Experiment Videos

Clinical evaluation of the dynamic observing tonometer.

Andrew J Morgan1, Sarah L Hosking, John F Salmon

  • 1Neurosciences Research Institute, School of Life and Health Sciences, Aston University, Birmingham, England.

Journal of Glaucoma
|August 10, 2002
PubMed
Summary

The Dynamic Observing Tonometer offers continuous intraocular pressure (IOP) monitoring with reasonable accuracy and repeatability, comparable to existing devices. This diagnostic contact lens shows potential for improved glaucoma assessment and management.

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Area of Science:

  • Ophthalmology
  • Medical Devices
  • Diagnostic Technology

Background:

  • Intraocular pressure (IOP) is a critical factor in glaucoma diagnosis and management.
  • Continuous IOP monitoring offers potential advantages over intermittent measurements.
  • The Dynamic Observing Tonometer (DOT) is a novel diagnostic contact lens designed for continuous IOP measurement.

Purpose of the Study:

  • To evaluate the accuracy of the Dynamic Observing Tonometer (DOT) compared to Goldmann applanation tonometry and pneumatonometry.
  • To assess the repeatability of IOP measurements obtained with the DOT.
  • To determine the device's capability in measuring pulse amplitude.

Main Methods:

  • 40 subjects underwent IOP measurement using Goldmann applanation tonometry.

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  • The DOT and a pneumatonometer were used for continuous IOP and pulse amplitude measurements.
  • Accuracy was assessed via mean bias and 95% limits of agreement; repeatability was evaluated using reliability coefficients.

    • Main Results:

    • DOT showed a mean bias of +2.1 mm Hg (95% limits of agreement: -4.0 to +8.2 mm Hg) versus Goldmann tonometry (r = 0.78).
    • Pulse amplitude measurements demonstrated a mean bias of +0.4 mm Hg (95% limits of agreement: -1.6 to +2.3 mm Hg) versus pneumatonometry (r = 0.78).
    • IOP measurement repeatability yielded a reliability coefficient of 0.91, with a mean difference of 0.4 mm Hg between readings.

    Conclusions:

    • The Dynamic Observing Tonometer exhibits a slight positive bias compared to Goldmann tonometry but demonstrates good correlation and acceptable repeatability.
    • The device accurately measures pulse amplitude, correlating well with pneumatonometry.
    • The DOT's performance suggests its potential as a reliable tool for continuous IOP monitoring in clinical settings.