BACKGROUND AND OBJECTIVE
To compare the intraocular pressures (IOP) obtained with dynamic contour tonometry (DCT) and Goldmann applanation tonometry (GAT) and to determine the dependency of both devices on corneal structure.
PATIENTS AND METHODS
One hundred forty eyes of 70 patients were included. Cases with corneal pathologies, former glaucoma diagnosis, and systemic diseases were excluded. All eyes underwent measurements of central corneal thickness (CCT) and corneal curvature. IOP measurements were obtained with GAT and DCT. The agreement of measurements was statistically analyzed.
RESULTS
The correlation of IOP values obtained with DCT and GAT was statistically significant. The mean DCT values were 0.46 ± 2.55 mm Hg higher than those of GAT, but this difference was statistically insignificant. Bland–Altman plots showed reasonable inter-method agreement between DCT and GAT measurements. GAT readings were significantly affected by CCT, but DCT measurements were affected by age and corneal curvature.
CONCLUSION
DCT is a reliable method of assessing IOP and is less dependent on central corneal thickness. This new technology may be a promising step forward in the management of glaucoma. Further studies are required to validate these observations.
[Ophthalmic Surg Lasers Imaging 2010;41:437-442.]
AUTHORS
From the Department of Ophthalmology, Uludag University School of Medicine, Bursa, Turkey.
Originally submitted January 2, 2009. Accepted for publication January 4, 2010. Posted online April 29, 2010.
Supported by a grant from the T-2005/8 Investigation Project of Uludag University, Bursa, Turkey.
The authors have no proprietary or financial interest in the materials presented herein.
Address correspondence to Hikmet Ozcetin, MD, Uludag Universitesi Tip Fakultesi, Goz Hast. AD, Gorukle, 16059, Bursa, Turkey.
doi: 10.3928/15428877-20100426-01
