05/10/2002 By Mark Moran
Calculating the intraoperative lens power for cataract surgery after photorefractive keratectomy (PRK) can be improved by using a corrected, refraction-derived keratometric value instead of the measured, preoperative value. In a nonrandomized, retrospective clinical study, researchers in The Netherlands identified nine patients (15 eyes) who underwent cataract surgery after prior PRK to correct myopia. The medical records of both the laser and cataract surgery centers were reviewed.
Eight different keratometric (K) values, measured or calculated, were entered into three different intraoperative lens (IOL) calculation formulas. Those formulas included SRK/T, Holladay 1, and Hoffer Q. The actual biometry and IOL parameters were used to predict postoperative refraction, which was compared with the actual refractive outcome. Also, the relative underestimation of the refractive change in corneal dioptric power by keratometry after PRK was calculated.
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