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Sucharita Boddu, Laurence T Sperber, A. John Kanellopoulos; Topography-guided (TG) LASIK vs Small Incision Lenticule Extraction (SMILE) : Posterior and Anterior Corneal Power Outcomes. Invest. Ophthalmol. Vis. Sci. 2017;58(8):5272. doi: https://doi.org/.
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© ARVO (1962-2015); The Authors (2016-present)
Evaluate safety, efficacy and changes of anterior and posterior corneal power of topo-guided LASIK vs. SMILE in contralateral eyes, in myopic laser refractive surgery.
In 22 myopic patients: 22 eyes had TG LASIK, and the contralateral eye had SMILE. Preoperative and postoperative evaluation of: spherical equivalent stability (SE). The eyes were divided in two groups of spherical equivalent (SE). The first group contains eyes with SE between -10 and -5.01 (High Zone) while the second group contains eyes with SE from -5 to 0. All data for corneal power were extracted from Optovue OCT device.
In the case of high zone, the anterior corneal power for SMILE technique was preoperatively 49.96±167 D and 43.23±1.99 D postoperatively. On the other hand, when EX500 method was used, preoperatively the corneal power was 50.20±1.58 D and 42.57±1.84 D postoperatively. The corresponding results for mild SE zone in the case of SMILE technique were 50.47±1.77 D preoperatively and 46.54±1.71 D. For the EX500 technique the corneal power pre-op and post-op was 49.35±2.43 D and 46.50±2.68 D respectively.Concerning posterior corneal power when SMILE method was used, in case of high SE zone the posterior corneal power changed from -6.16±0.23 D pre-op to 6.18±0.28 D post-op. When EX500 method was used the corresponding results were 6.21±0.22 D and -6.24±0.22 D. Finally in the case of mild SE zone the posterior corneal power increased from -6.23±167 to -6.26±0.26 D when SMILE method was applied, while for the eyes that surged with EX500 technique the posterior corneal power was -6.15±0.37 D pre-op and -6.16±0.38 D post-op.
Anterior and posterior corneal power was calculated after SMILE and EX500 refractive operations. The results presented, clearly showed that after EX500 operation, anterior corneal power is lower in comparison to SMILE operation in high SE zone. In mild SE zone the anterior corneal power is almost the same for the both methods. On the other hand the posterior corneal power remains unchanged, regardless the SE zone and the operation method.
This is an abstract that was submitted for the 2017 ARVO Annual Meeting, held in Baltimore, MD, May 7-11, 2017.
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