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[What should we think? Is pneumotonometry still reliable?].

H Bresson-Dumont1, A Lehoux, C Kponoume

  • 1Clinique Sourdille, 8, rue Camille-Flammarion, 44000 Nantes, France.

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|October 5, 2007
PubMed
Summary

Noncontact tonometer (NCT) shows reliability but differs from Goldmann tonometry (GAT) based on central corneal thickness (CCT). NCT is less reliable for glaucoma follow-up with atypical CCT or intraocular pressure (IOP).

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering

Background:

  • Noncontact tonometer (NCT) and Goldmann tonometer (GAT) are applanation tonometry methods.
  • While NCT is widely studied for reliability, discrepancies in intraocular pressure (IOP) measurements persist.

Purpose of the Study:

  • To compare IOP measurements between NCT and GAT.
  • To investigate the influence of central corneal thickness (CCT) on the agreement between NCT and GAT.

Main Methods:

  • Intraocular pressure (IOP) was measured in 340 patients (668 eyes) using both NCT and GAT.
  • Patients were categorized into three groups based on CCT: <500 microm, 520-580 microm, and >600 microm.

Main Results:

  • The mean difference between NCT and GAT varied significantly with CCT.
  • Differences were -1.4 mmHg for thinner corneas, +0.13 mmHg for regular corneas, and +3.04 mmHg for thicker corneas.
  • CCT, higher IOPs, and younger age influenced the discrepancy between NCT and GAT.

Conclusions:

  • Noncontact tonometer (NCT) is suitable for initial glaucoma screening.
  • Goldmann tonometer (GAT) demonstrates greater reliability for glaucoma follow-up, especially when CCT and IOP deviate from normal ranges.