Purpose: Clinically evaluate a modified applanating surface Goldmann tonometer prism designed to substantially negate errors due to patient variability in biomechanics. Methods: A modified Goldmann prism with a correcting applanation tonometry surface (CATS) was mathematically optimized to minimize the intraocular pressure (IOP) measurement error due to patient variability in corneal thickness, stiffness, curvature, and tear film adhesion force. A comparative clinical study of 109 eyes measured IOP with CATS and Goldmann prisms. The IOP measurement differences between the CATS and Goldmann prisms were correlated to corneal thickness, hysteresis, and curvature. Results: The CATS tonometer prism in correcting for Goldmann central corneal thickness (CCT) error demonstrated a reduction to <+/- 2 mmHg in 97% of a standard CCT population. This compares to only 54% with CCT error <+/- 2 mmHg using the Goldmann prism. Equal reductions of similar to 50% in errors due to corneal rigidity and curvature were also demonstrated. Conclusion: The results validate the CATS prism's improved accuracy and expected reduced sensitivity to Goldmann errors without IOP bias as predicted by mathematical modeling. The CATS replacement for the Goldmann prism does not change Goldmann measurement technique or interpretation.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/624648 |
| Date | 05 1900 |
| Creators | McCafferty, Sean, Lim, Garrett, Duncan, William, Enikov, Eniko, Schwiegerling, Jim, Levine, Jason, Kew, Corin |
| Contributors | Univ Arizona, Dept Ophthalmol, Coll Opt Sci, Univ Arizona, Coll Engn, Dept Aerosp & Mech |
| Publisher | DOVE MEDICAL PRESS LTD |
| Source Sets | University of Arizona |
| Language | English |
| Detected Language | English |
| Type | Article |
| Rights | © 2017 McCafferty et al. This work is published and licensed by Dove Medical Press Limited. The full terms of this license are available at https://www.dovepress.com/terms.php and incorporate the Creative Commons Attribution – Non Commercial (unported, v3.0) License |
| Relation | https://www.dovepress.com/goldmann-tonometer-error-correcting-prism-clinical-evaluation-peer-reviewed-article-OPTH |
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