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The effect of contact lens-induced oedema on the accuracy of Goldmann tonometry in a mature population
  1. Kirsten E Hamilton (hamiltonke1{at}cardiff.ac.uk),
  2. David C Pye (d.pye{at}unsw.edu.au),
  3. Jiyoon Chung,
  4. Sarshia Hua,
  5. Qian Hou,
  6. Fei Yu
  1. Cardiff University, United Kingdom
  2. University of New South Wales, Australia
  3. University of New South Wales, Australia
  4. University of New South Wales, Australia
  5. University of New South Wales, Australia
  6. University of New South Wales, Australia

    Abstract

    Aims To determine the effect of contact lens-induced oedema on the accuracy of Goldmann tonometry measurements of intraocular pressure (IOP) in mature subjects.

    Methods: 22 healthy subjects aged between 50 and 60y were recruited for this study. Corneal curvature, IOP, and central corneal thickness (CCT) were measured before and after 2h of monocular closed-eye wear of a thick hydroxyethyl methacrylate (HEMA) contact lens. Measurements were then repeated at 20min intervals for 1h after lens removal.

    Results: CCT (+54.1μm) and IOP (+2.7mmHg, p<0.001, paired t-test with Bonferroni correction) increased significantly after lens wear. For the hour following lens removal, the measured IOP was correlated to the increase in CCT (r=0.84, p<0.001), at a rate of 1.0mmHg/10μm (95% CI 0.8-1.2mmHg/10μm, linear mixed model analysis).

    Conclusion: A relatively small increase in CCT due to contact lens-induced corneal oedema caused an overestimation error in Goldmann tonometry measurements of IOP in healthy mature subjects.

    • aging
    • corneal thickness
    • oedema
    • tonometry

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