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[Theoretical basis of goldmann applanation tonometry]
W Wiegand1, B Schroeder, A Hager
1Augenabteilung Klinikum Nord/Heidberg, Hamburg. augen-klinikum-nord@gmx.de
Klinische Monatsblatter Fur Augenheilkunde
|July 22, 2005
Summary
Goldmann applanation tonometry is the standard for measuring intraocular pressure but has limitations. This review explores factors affecting measurements and discusses alternative tonometry methods for more accurate results.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Optometry
Background:
- Goldmann applanation tonometry (GAT) has been the gold standard for intraocular pressure (IOP) measurement for over 50 years.
- GAT relies on simplified physical principles and has inherent flaws and restrictions, potentially affecting measurement accuracy.
Purpose of the Study:
- To enhance understanding of the methodological basis of GAT.
- To identify key factors influencing IOP measurements, including corneal properties and axial length.
- To review alternative tonometry devices and discuss future advancements.
Main Methods:
- Review of the physical principles underlying Goldmann applanation tonometry.
- Analysis of factors such as corneal thickness, corneal radius, axial length, and corneal morphology.
- Discussion of the principles of other common tonometer devices.
Main Results:
- Identified oversimplifications and limitations in the methodology of Goldmann applanation tonometry.
- Highlighted significant influencing factors on intraocular pressure measurements.
- Provided an overview of alternative tonometry techniques.
Conclusions:
- Goldmann applanation tonometry, despite its long-standing use, has limitations impacting accurate intraocular pressure assessment.
- Understanding influencing factors and exploring newer tonometry technologies are crucial for improving IOP measurement accuracy.