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The pressure phosphene tonometer--a clinical evaluation.

G S M Chew1, G F Sanderson, A C B Molteno

  • 1Eye Department, Dunedin Hospital, Dunedin, New Zealand.

Eye (London, England)
|June 12, 2004
PubMed
Summary

Pressure phosphene tonometry using the Proview eye pressure monitor had a lower success rate and showed significant differences in intraocular pressure (IOP) measurements compared to Goldmann tonometry.

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Area of Science:

  • Ophthalmology
  • Medical Devices
  • Diagnostic Techniques

Background:

  • Intraocular pressure (IOP) measurement is crucial for diagnosing and managing glaucoma.
  • Goldmann applanation tonometry is the established gold standard for IOP assessment.
  • Pressure phosphene tonometry is a newer technique aiming to measure IOP by inducing a pressure phosphene.

Purpose of the Study:

  • To compare the efficacy and accuracy of pressure phosphene tonometry with Goldmann applanation tonometry.
  • To evaluate the success rate of obtaining readings with the Proview eye pressure monitor.

Main Methods:

  • A randomized study involving 100 patients (196 readings) at a general ophthalmology clinic.
  • Patients received either pressure phosphene tonometry (Proview) or Goldmann tonometry first, performed by different examiners.
  • Intraocular pressure readings were compared between the two methods.

Main Results:

  • Pressure phosphene tonometry readings were obtained in only 69% of eyes (136/196), while Goldmann tonometry achieved 100% success.
  • The mean IOP measured by pressure phosphene tonometry was 18.5 mmHg, versus 16.0 mmHg with Goldmann tonometry.
  • A mean difference of +2.43 mmHg was observed, with wide confidence intervals, indicating common large discrepancies.

Conclusions:

  • 31% of patients could not perceive a pressure phosphene with the Proview device.
  • Significant discrepancies between pressure phosphene tonometry and Goldmann tonometry readings were common among patients who could perceive the phosphene.
  • The Proview eye pressure monitor demonstrated limitations in obtaining consistent and comparable IOP measurements to Goldmann tonometry.

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