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Aspheric ablation depth as target depth for enhanced wavefront-guided myopic retreatments after laser-assisted in situ keratomileusis

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Session Details

Session Title: Presented Poster Session: Keratorefractive Surgery Outcomes - Myopia

Session Date/Time: Sunday 06/09/2015 | 09:30-11:00

Paper Time: 10:00

Venue: Poster Village: Pod 2

First Author: : E.Shen TAIWAN

Co Author(s): :    Y. Hsu   F. Hu           

Abstract Details


To propose a new adjustment method and present the clinical result of wavefront-guided myopic LASIK retreatment with aspheric program targeted central ablation depth to avoid refractive overcorrection.


National Taiwan University Hospital, Taipei, Taiwan


Thirty-two eyes (20 consecutive patients) received wavefront-guided LASIK myopic retreatment between January 2009 and February 2012 after primary wavefront-guided LASIK for myopia were included. Wavefront-guided retreatments were performed using the Bausch and Lomb Technolas 217z100 excimer laser system. Wavefront-guided retreatments were adjusted by setting the ablation depth corresponding to the ablation depth determined by the aspheric program. Refractive outcome, visual outcome, and outcome of high-order aberration (HOA) were analyzed.


The mean age was 29.5 ± 3.1 years. Spherical equivalent (SE) before LASIK retreatment was -1.0 ± 0.44 diopters. Twelve months postop, SE was -0.03 ± 0.12 D, and was all within ±0.5D. No eyes exhibited refractive overcorrection. At postoperative 12 months, 31/32 eyes had UCVA greater than 20/20. No eyes had lost more than 2 lines of Snellen VA. The safety and efficacy indices were 1.03 and 1.00, respectively. Total HOA, coma, and trefoil reduced significantly (P =0.028, P =0.036, P=0.34, respectively). Predictive factors for retreatment offset is related to preoperative SE (P =0.006) and spherical aberration (P =0.03).


Setting the target ablation depth using the aspheric program provided high refractive predictability with satisfactory visual outcome, significant reduction of HOA and no overcorrections.

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