Evaluating Central Corneal Thickness Measurements With Noncontact Optical Low-Coherence Reflectometry and Contact Ultrasound Pachymetry - 18/08/11
Inquiries to Richard E. Braunstein, MD, Edward S. Harkness Eye Institute, 635 W 165th Street, Box 39, New York, NY 10032Résumé |
Purpose |
To compare the central corneal thickness (CCT) measurements obtained with noncontact optical low-coherence reflectometry (OLCR) and ultrasound (US) pachymetry.
Design |
Prospective, comparative observational study.
Methods |
Three sequential ultrasonic measurements and a set of five OLCR scans of 52 eyes of 26 healthy subjects were recorded. Noncontact measurement was repeated five minutes after anesthetic drop instillation.
Results |
Mean CCT values for noncontact OLCR and US pachymetry were 544.03 μm and 548.66 μm, respectively, with mean SDs of 0.97 μm and 4.63 μm, respectively. Noncontact OLCR measured on average 4.64 μm less than US pachymetry (95% confidence interval −7.56 to −1.72; P = .003). The OLCR measured 1.68 μm less than US pachymetry in the thinner cornea group (≤548.7 μm, n = 24) and 7.48 μm less in the thicker group (n = 25). This difference was statistically significant (P = .04).
Conclusions |
There was agreement between the two pachymetric measurements. Noncontact OLCR appeared to measure slightly smaller than US pachymetry.
Le texte complet de cet article est disponible en PDF.| Haag-Streit AG, Koeniz, Switzerland, provided noncontact optical low-coherence reflectometry to the Department of Ophthalmology, Columbia University, New York, New York. |
Vol 142 - N° 1
P. 164-165 - juillet 2006 Retour au numéro
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