Intraocular lens power calculation after incisional and thermal keratorefractive surgery

Abstract

Purpose: To evaluate the efficacy of corneal topography in determining the central corneal refractive power in intraocular lens (IOL) power calculations after incisional and thermal keratorefractive surgery.

Setting: Oregon Eye Institute, Eugene, Oregon, USA.

Methods: This retrospective review comprised 20 eyes (14 patients) that had cataract extraction with IOL implantation or refractive lens exchange after radial keratotomy, hexagonal keratotomy, or laser thermal keratoplasty. The effective refractive power (EffRP) of the Holladay Diagnostic Summary on the EyeSys Corneal Analysis System was used to determine the central corneal refractive power, which was input into the Holladay 2 IOL calculation formula.

Results: Eighty percent of eyes achieved a postoperative spherical equivalent refraction within +/-0.50 diopter of emmetropia.

Conclusion: The use of the EffRP increases the likelihood of an acceptable refractive outcome after cataract or refractive lens exchange surgery in eyes with a history of keratorefractive surgery.