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Pneumotonometry using sterile single-use tonometer covers.

M J Hodkin1, M A Pavilack, D C Musch

  • 1Department of Ophthalmology, University of Michigan, Ann Arbor.

Ophthalmology
|May 1, 1992
PubMed
Summary
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Disposable latex covers provide a sanitary and convenient method for measuring intraocular pressure (IOP). This alternative to chemical disinfection ensures accurate IOP readings, reducing risks associated with traditional cleaning methods.

Area of Science:

  • Ophthalmology
  • Biomedical Engineering

Background:

  • Current pneumotonometer tip disinfection relies on chemical agents, posing risks of incomplete disinfection, corneal exposure, and tip damage.
  • Existing methods are time-consuming and may compromise the integrity of the tonometer tip.

Purpose of the Study:

  • To evaluate the efficacy and accuracy of disposable latex covers for pneumotonometer tips in measuring intraocular pressure (IOP).
  • To assess the cover's suitability as a sanitary and convenient alternative to chemical disinfection.

Main Methods:

  • A disposable latex cover was applied to pneumotonometer tips for IOP measurement in 187 eyes across glaucoma screening and cornea clinics.
  • IOP measurements with and without the cover were compared.
  • A cadaver eye study assessed readings with known IOP values.

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Main Results:

  • The mean absolute IOP difference with and without the cover was minimal (1.6 mmHg in glaucoma screening, 1.8 mmHg in cornea clinic).
  • No significant difference was observed in IOP readings between covered and uncovered tips in cadaver eyes.
  • A tonographic-like effect from repeated tonometry was noted.

Conclusions:

  • Disposable latex covers are a viable, accurate, and safe alternative for pneumotonometer tip use.
  • This method enhances sanitation and convenience compared to traditional chemical disinfection protocols.
  • The use of covers maintains the accuracy of intraocular pressure measurements.