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Comparison between dynamic contour tonometry and Goldmann applanation tonometry.

Jooeun Lee1, Chang Hwan Lee, Jaewan Choi

  • 1Department of Ophthalmology, College of Medicine, University of Ulsan, Asan Medical Center, Seoul, Korea.

Korean Journal of Ophthalmology : KJO
|April 2, 2009
PubMed
Summary
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Dynamic contour tonometry (DCT) shows less central corneal thickness (CCT) influence on intraocular pressure (IOP) measurements compared to Goldmann applanation tonometry (GAT), especially in normal CCT eyes.

Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Optometry

Background:

  • Intraocular pressure (IOP) is a critical metric in glaucoma diagnosis and management.
  • Central corneal thickness (CCT) is known to influence IOP measurements, potentially leading to inaccuracies.
  • Comparing different tonometry methods is essential for understanding their reliability across varying CCT.

Purpose of the Study:

  • To compare intraocular pressures (IOPs) measured by dynamic contour tonometry (DCT) and Goldmann applanation tonometry (GAT).
  • To investigate the association between varying central corneal thickness (CCT) and IOP measurements obtained by DCT and GAT.

Main Methods:

  • A prospective study involving 451 eyes from 233 subjects.
  • IOPs were measured using both Goldmann applanation tonometry (GAT) and dynamic contour tonometry (DCT).
Keywords:
Central corneal thicknessDynamic contour tonometryGoldmann applanation tonometry

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  • Subjects' eyes were categorized into low, normal, and high CCT groups to analyze CCT's effect on each tonometry method.

    • Main Results:

    • A significant positive correlation was found between GAT and DCT IOP measurements (R=0.853, p<0.001).
    • Central corneal thickness (CCT) significantly affected IOP measurements from both GAT and DCT (p<0.001).
    • Subgroup analysis indicated CCT affected GAT in normal and high CCT groups, but DCT only in the high CCT group.

    Conclusions:

    • Dynamic contour tonometry (DCT) showed minimal impact from CCT in eyes with low to normal corneal thickness.
    • Central corneal thickness (CCT) significantly influenced Goldmann applanation tonometry (GAT) measurements across more CCT ranges than DCT.
    • DCT may offer a more reliable IOP measurement across a wider range of CCT compared to GAT.