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Ocular pulse amplitude measurement using pascal dynamic contour tonometer in glaucoma patients.

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Correlation between Central Corneal Thickness and Intraocular Pressure Measured by Goldmann Applanation Tonometry or

J M Katsimpris1, P E Theoulakis2, K Vasilopoulos1

  • 1Department of Ophthalmology, General Hospital of Patras "Agios Andreas", Patras, Greece.

Klinische Monatsblatter Fur Augenheilkunde
|April 23, 2015
PubMed
Summary

Central corneal thickness impacts intraocular pressure readings from Goldmann applanation tonometry. However, Pascal dynamic contour tonometry measurements are not affected by central corneal thickness.

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Area of Science:

  • Ophthalmology
  • Glaucoma Research
  • Ocular Biomechanics

Background:

  • Intraocular pressure (IOP) is a key metric in diagnosing and managing glaucoma.
  • Central corneal thickness (CCT) is known to influence IOP measurements.
  • Different tonometry methods may be variably affected by CCT.

Purpose of the Study:

  • To investigate the relationship between CCT and IOP.
  • To compare this relationship using Goldmann applanation tonometry (GAT) and Pascal dynamic contour tonometry (PDCT).

Main Methods:

  • Study included 45 individuals (90 eyes) across four groups: normal volunteers, primary open-angle glaucoma, normal-tension glaucoma, and ocular hypertension.
  • IOP was measured using both GAT and PDCT.
  • CCT was measured using ultrasound pachymetry.

Main Results:

  • A positive, albeit weak, correlation was found between CCT and IOP measured by GAT.
  • No significant correlation was observed between CCT and IOP measured by PDCT.
  • These findings suggest CCT is a confounding factor for GAT but not PDCT.

Conclusions:

  • CCT is a significant variable affecting IOP measurements obtained via GAT.
  • PDCT provides IOP measurements that are independent of CCT.
  • PDCT may offer a more reliable IOP assessment in diverse corneal thicknesses.