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Published on: October 21, 2022
Central corneal thickness and Diaton transpalpebral tonometry
Mustafa Ilker Toker1, Ayse Vural, Haydar Erdogan
1Department of Ophthalmology, Cumhuriyet University School of Medicine, 58140 Sivas, Turkey. ilkertoker@gmail.com
Summary
Central corneal thickness impacts intraocular pressure (IOP) measurements from the Diaton tonometer. Diaton readings showed moderate correlation with Goldmann applanation tonometry (GAT), but were more affected by thinner corneas.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Clinical Measurement
Background:
- Central corneal thickness (CCT) is a critical factor influencing intraocular pressure (IOP) measurements.
- Transpalpebral tonometry (Diaton) offers a non-contact method for IOP assessment, but its accuracy relative to Goldmann applanation tonometry (GAT) requires investigation.
- Understanding the impact of CCT on Diaton measurements is essential for accurate glaucoma diagnosis and management.
Purpose of the Study:
- To evaluate the influence of central corneal thickness on intraocular pressure (IOP) measurements obtained via Diaton tonometry.
- To determine the correlation between IOP readings from the Diaton tonometer and the Goldmann applanation tonometer (GAT).
- To assess how variations in corneal thickness affect the agreement between Diaton and GAT IOP measurements.
Main Methods:
- A cross-sectional study involving 162 eyes from 81 participants.
- Intraocular pressure (IOP) was measured using both Diaton and Goldmann applanation tonometry (GAT).
- Central corneal thickness was measured using ultrasound pachymetry, and participants were stratified into three groups based on corneal thickness (<530 µm, 530–560 µm, >560 µm).
Main Results:
- Moderate correlations were observed between Diaton and corrected GAT (C-GAT) IOP measurements (r = 0.303) and between corrected Diaton (C-Diaton) and C-GAT (r = 0.399).
- Mean Diaton readings were slightly lower than C-GAT measurements, with a mean difference of 0.9 ± 3.8 mmHg for Diaton and 0.7 ± 3.5 mmHg for C-Diaton.
- Goldmann applanation tonometry (GAT) values showed greater variability across corneal thickness groups compared to Diaton measurements, particularly in eyes with the thinnest corneas.
Conclusions:
- Diaton tonometer measurements demonstrate a moderate correlation with Goldmann applanation tonometry.
- Corneal thickness, especially in thinner corneas, appears to have a more pronounced effect on Diaton tonometer readings.
- Further research may be needed to refine Diaton tonometry use in populations with varying corneal thicknesses.