Intraocular lens power calculation in high myopic eyes with previous radial keratotomy.
OBJECTIVE
To determine an accurate method of intraocular lens (IOL) power calculation in highly myopic eyes with previous radial keratotomy (RK).


METHODS
Five eyes that had undergone RK with preoperative myopia >-14.0 diopters (D) were studied retrospectively. The keratometric values obtained with the clinical history method, contact lens over-refraction method, conventional keratometry, adjusted keratometry, and Orbscan II were compared to the true keratometric value calculated retrospectively with the SRK/T formula.


RESULTS
The true keratometric value was closest to that from the contact lens over-refraction method in one eye and to the flatter keratometric value between simulated keratometry (Sim K) and the 3-mm diameter central zone mean keratometric value obtained with axial keratometric power map of Orbscan II in four eyes.


CONCLUSIONS
The flatter keratometric value between Sim K and the 3-mm zone mean keratometric value from Orbscan II was closest to the true postoperative RK keratometric value of the central cornea.
Han
Eui Seok
ES
Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea.
Lee
Jin Hak
JH
D000328:Adult; D019781:Corneal Topography; D005260:Female; D006801:Humans; D007646:Keratotomy, Radial; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D009216:Myopia / Q000601:surgery*; D055095:Optics and Photonics; D018918:Phacoemulsification; D012189:Retrospective Studies