Hyperopic LASIK with corneal vertex centration minimizes postop higher-order aberrations

Issue: March 25, 2016

LASIK for high hyperopia with corneal vertex centration and asymmetric offset yielded a low risk of postoperative higher-order aberrations, according to a study.

“Maintaining postoperative keratometry less than 49 D after hyperopic LASIK and centering on the corneal vertex reduces the induction of coma compared to non-aspheric profiles and lower hyperopia,” the study authors said. “The use of corneal vertex centration results in a morphologically stable cornea, less topographic asymmetry and enhanced stability.”

The retrospective review included 46 eyes of 26 patients who underwent LASIK with the Amaris 750S excimer laser and Carriazo-Pendular microkeratome (both Schwind eye-tech solutions).

Preoperatively, mean spherical equivalent was +3.43 D and mean refractive astigmatism was 1.09 D. At final follow-up at 6 months postoperatively, mean spherical equivalent was +0.21 D and mean refractive astigmatism was 0.39 D. The difference in spherical equivalent was statistically significant (P < .0001).

Postoperative uncorrected distance visual acuity was 20/25 or better in 74% of eyes at 1 month, 65% at 3 months and 79% at 6 months. Corrected distance visual acuity was 20/25 or better in 85% of eyes preoperatively, and no eyes lost more than two Snellen lines. Corrected distance visual acuity decreased a mean 0.2 lines at 1 month but rebounded to preoperative values at 3 months and 6 months.

There was a statistically significant correlation between preoperative and postoperative aberration values for vertical trefoil (P < .0005), vertical coma (P < .0005), oblique tetrafoil (P < .0001), secondary cardinal astigmatism (P < .05), cardinal tetrafoil (P < .05) and secondary vertical trefoil (P < .05), according to the study. – by Matt Hasson

Disclosure: Arba-Mosquera reports he is employed by Schwind eye-tech solutions. de Ortueta reports he is a consultant for Schwind eye-tech solutions.

Published by:

Sources/Disclosures

Collapse

Source:

Arba-Mosquera S, et al. J Refract Surg. 2016;doi:10.3928/1081597X-20151119-04.