Determining in vivo biomechanical properties of the cornea with an ocular response analyzer
Top Cited Papers
- 1 January 2005
- journal article
- Published by Ovid Technologies (Wolters Kluwer Health) in Journal of Cataract & Refractive Surgery
- Vol. 31 (1), 156-162
- https://doi.org/10.1016/j.jcrs.2004.10.044
Abstract
Purpose: To study the results of an ocular response analyzer (ORA) to determine the biomechanical properties of the cornea and their relationship to intraocular pressure (IOP). Setting: Reichert Inc., Depew, New York, USA. Methods: The ORA (Reichert) makes 2 essentially instantaneous applanation measurements that permit determination of corneal and IOP effects. Results: Measurements of several populations indicate that corneal hysteresis, a biomechanical measure, varied over a dynamic range of 1.8 to 14.6 mm Hg and was only weakly correlated with corneal thickness (r2 = 0.12); this is related to the observation that some subjects with relatively thick corneas have less-than-average corneal hysteresis. Corneal hysteresis changes diurnally, presumably as a result of hydration changes. Keratoconus, Fuchs' dystrophy, and post-LASIK patients demonstrated low corneal hysteresis. Conclusion: The corneal hysteresis biomechanical measure may prove valuable for qualification and predictions of outcomes of refractive surgery and in other cases in which corneal biomechanics are important.Keywords
This publication has 1 reference indexed in Scilit:
- Human Corneal Thickness and Its Impact on Intraocular Pressure Measures: A Review and Meta-analysis ApproachSurvey of Ophthalmology, 2000