Intraocular lens power calculation following corneal refractive surgery

Abstract

Since the number of refractive corneal surgical procedures is expected to increase, an increasingly volume of cataract surgeries after refractive corneal surgery is anticipated; Therefore, timely development and testing of refined methods for accurate intraocular lens power prediction after different types of refractive surgery is necessary. actually the main problem is measuring the corneal power due to the difference in peripheral and central curvatures following corneal surgery.

Mismeasurements and miscalculations of corneal power after refractive surgery lead to an overestimation of the decreased central corneal power after myopic procedures resulting in hyperopic surprise.

Essentially, three methods are recommended for determining the most accurate keratometric values after refractive surgery and for reducing the IOL prediction error: I) the perioperative data method. 2) the contact lens overrefraction method. 3) calculation of the corneal power by anterior surface keratometry readings.

The axial length measurement is more or less not impaired in postkeratorefractive patients than in standard cataract patients. In general, the choice of IOL formula for non-average eyes depends on the amount of deviation from normal axial length. •