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Applanation tonometry and correction according to corneal thickness

R Stodtmeister1

  • 1Department of Ophthalmology, St. Elisabeth Hospital, Rodalben (Palatinate), Germany.

Acta Ophthalmologica Scandinavica
|August 1, 1998
PubMed
Summary

Central corneal thickness significantly impacts applanation tonometry readings. Many patients require intraocular pressure (IOP) corrections based on their corneal thickness to ensure accurate measurements in ophthalmic practices.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Biomedical Engineering

Background:

  • Central corneal thickness (CCT) is a known factor affecting applanation tonometry measurements.
  • Accurate intraocular pressure (IOP) measurement is crucial for diagnosing and managing glaucoma.

Purpose of the Study:

  • To determine the frequency and magnitude of necessary corrections for applanation tonometry readings based on CCT in a clinical setting.
  • To quantify the clinical relevance of CCT on IOP measurements.

Main Methods:

  • Ultrasound pachymetry was used to measure CCT in 579 patients under typical practice conditions.
  • Correction values for IOP were calculated based on individual CCT measurements.

Main Results:

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  • Half of the patients required IOP correction values of +/-2 mm Hg or more.
  • A quarter of patients needed corrections of +/-3 mm Hg or higher.
  • Approximately 20% of patients had correction values of +/-4 mm Hg or greater.

    • Conclusions:

    • CCT significantly influences applanation tonometry results to a clinically relevant degree.
    • Routine CCT measurement and subsequent IOP correction are recommended for accurate ophthalmic assessments.