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Related Experiment Videos

Tonometer utilization, accuracy, and calibration under field conditions.

I F Wessels1, Y Oh

  • 1Department of Ophthalmology, Loma Linda, University, CA 92354.

Archives of Ophthalmology (Chicago, Ill. : 1960)
|December 1, 1990
PubMed
Summary
This summary is machine-generated.

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Many tonometers used by ophthalmologists are inaccurate, with some over 2 mm Hg off. Regular calibration by practitioners improves accuracy, but most lack proper knowledge.

Area of Science:

  • Ophthalmology
  • Medical Device Technology

Background:

  • Tonometry is crucial for diagnosing glaucoma.
  • Accurate intraocular pressure measurement is vital for patient management.

Purpose of the Study:

  • To assess the accuracy of tonometers in routine clinical use.
  • To identify factors affecting tonometer accuracy and calibration practices.

Main Methods:

  • A field survey of 185 tonometers (127 slit lamp-mounted, 48 hand-held, 10 noncontact) in 94 ophthalmology offices.
  • Analysis of tonometer error relative to manufacturer specifications and calibration records.

Main Results:

  • 19% of applanation tonometers exceeded 1 mm Hg error; 4.5% exceeded 2 mm Hg.
  • Hand-held tonometers were less accurate than slit lamp-mounted devices.

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  • Accuracy correlated with tonometer age and usage; practitioner-performed calibration yielded better results.

    • Conclusions:

    • Significant tonometer inaccuracy exists in clinical practice.
    • Improved training on calibration procedures is needed for ophthalmologists.
    • Regular, practitioner-led calibration enhances tonometer accuracy.