Accuracy of Refractive Results in Post-Myopic LASIK Patients Having Refractive Cataract Surgery

Monday, April 20, 2015: 3:56 PM
Room 1A (San Diego Convention Center)
Gary Foster, MD

Evaluate the accuracy of refractive results in post-myopic LASIK patients undergoing refractive cataract surgery.

Retrospective analysis of 35 cataract cases performed at a single center. In all cases the patient had a history of prior myopic LASIK. All eyes underwent microincisional cataract surgery with phacoemulsification and implantation of an IOL. IOL power selection was guided by intraoperative aberrometry.  Manifest refraction and visual acuity were recorded at 1 month. The mean absolute value of the prediction error (MAVPE), median absolute error (MAE), and distribution of absolute errors were calculated. Results were compared to findings previously reported in the literature.

In these post-myopic LASIK eyes, the MAVPE was 0.39 ± 0.36 D.  MAE was 0.34 D (range 0.02 D to 1.88 D).  Ninety-seven percent of eyes had an absolute error within 1.00 D of predicted postoperative spherical equivalent (SE); 94% within 0.75 D; 71% within 0.50 D, and 46% within 0.25 D. Published MAVPE for the Haigis-L formula is 0.66 ±0.60 D, with 48% of eyes within 0.50 D of predicted postoperative SE. For the Shammas post-refractive formula, the published MAVPE is 0.60 ± 0.54 D, with 50% within 0.50 D of predicted postoperative spherical SE.

The MAVPE in this series is better that results reported previously in the literature for other methods of calculating IOL power in post-myopic LASIK cataract patients. The percentage of eyes within 0.50 D of predicted postoperative SE was also higher in this series than reported in the literature.