Measuring corneal power for intraocular lens power calculation after refractive surgery
- 1 November 2002
- journal article
- case report
- Published by Ovid Technologies (Wolters Kluwer Health) in Journal of Cataract & Refractive Surgery
- Vol. 28 (11), 1932-1938
- https://doi.org/10.1016/s0886-3350(02)01438-4
Abstract
To find a more accurate and predictable method for intraocular lens (IOL) power calculation in eyes after refractive surgery. Department of Ophthalmology, Kangnam St. Mary's Hospital, Seoul, Korea. The accuracy of the following methods for calculating IOL power in 132 eyes after PRK or LASIK was compared: manual keratometry, hard contact lens, refraction-derived keratometry at the corneal plane, and the refraction-derived keratometry at the spectacle plane. Based on this comparison, the IOL power was calculated in the 2 eyes of a patient using refraction-derived keratometry at the spectacle plane with the SRK II formula. Cataract surgery with IOL implantation was then performed. The largest corneal power values were obtained using a manual keratometer and the smallest using refraction-derived keratometry at the spectacle plane (P <.001). In the patient having cataract surgery with IOL implantation, near target refraction was achieved with minimal error in IOL power. If the corneal power is known before refractive surgery, the use of the smallest value of those obtained using refraction-derived keratometry and the hard contact lens method is recommended. However, if the corneal power before refractive surgery is unknown, the use of the hard contact lens method is recommended.Keywords
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