Intraocular Lens Power Calculation in Cataract Surgery after Excimer Laser Photorefractive Keratectomy

ABSTRACT

To evaluate the accuracy of a new IOL power calculation method, the intraocular lens[IOL]power using a new method [refraction corrected method]was compared with the IOL power calculated using refraction derived keratometric values and conventional keratometry values in 4 eyes of 4 patients received cataract surgery after Excimer PRK.We performed phacoemulsifications and implanted intraocular lens, the power of which was calculated using the new method, and checked refractive errors 2 months after cataract surgery.The intraocular lens powers calculated using refraction derived keratometric values were lower than those calculated using the new method in the range of 0.52 diopter to 2.48 diopter.The intraocular lens powers calculated using conventional keratometry values were much lower than those calculated using the new method and refrac-tion derived keratometric value.Conclusively, the conventional method should not be used in IOL power calculation in catarct surgery after Excimer laser PRK, and in that case our new method is more accurate than a method using refraction derived keratometry value.