Scheimpflug photography keratometry readings for routine intraocular lens power calculation
- 1 February 2009
- journal article
- Published by Ovid Technologies (Wolters Kluwer Health) in Journal of Cataract & Refractive Surgery
- Vol. 35 (2), 330-334
- https://doi.org/10.1016/j.jcrs.2008.10.041
Abstract
To prospectively evaluate keratometry (K) values obtained by Scheimpflug photography in eyes scheduled for cataract surgery, compare the results with K values obtained with an autokeratometer (automated K), and evaluate the K values in commonly used intraocular lens (IOL) power calculation formulas for routine cataract surgery. Private clinical ophthalmology practice, Lynwood, California, USA. The mean simulated K power (simulated K), equivalent K (equivalent K), and true net power (true net K) readings from the Pentacam Comprehensive Eye Scanner were compared with the automated K readings. Automated K, simulated K, and equivalent K values were compared in commonly used IOL power calculation formulas. The mean automated K value was 43.49 diopters (D) ± 1.75 (SD) and the mean simulated K value, 43.49 ± 2.00 D (P>.1). The mean equivalent K value was 43.78 ± 1.97 D and exceeded the mean automated K and simulated K by 0.29 D (P>.1). The mean true net K was 42.31 ± 2.13 D, which was 1.18 D lower than the automated K and simulated K values (P = .015). The IOL prediction mean absolute error was 0.41 ± 0.27 D using the automated K method, 0.50 ± 0.36 D using the simulated K method (difference 0.09 D) (P>.1), and 0.65 ± 0.35 D using the equivalent K method (difference 0.24 D) (P<.01). The K values from Scheimpflug photography did not improve accuracy over autokeratometer values for routine IOL power calculation.Keywords
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