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Title	Corneal Changes in ReLEx smile
Abstract Nr.	1066

Purpose	In this study, we used a Schwind Sirius® Scheimpflug device to evaluate the corneal changes that occur after ReLEx smile laser eye surgery, a new technique in refractive corneal surgery.
Methods	Our study included 46 consecutive treatments of 23 patients. All patients were treated for myopia and myopic astigmatism using Small Incision Lenticule Extraction (ReLEx smile). The eyes were examined preoperatively and 3 months postoperatively using a Sirius® Scheimpflug tomographer to assess corneal changes with regard to curvature, elevation, and centration of the treated zone.
Results	Preop spherical equivalent was -3.98 (range -1.5 to -7.25) diopters. At 3 months, postop spherical equivalent was -0.12 (range -0,62 to + 0.5). No patients lost 1 line of BCVA. 91 % had an UCVA of 0.8 or more, 83 % had an UCVA of 1.0 or more. A statistically significant decrease in mean keratometric power of the anterior corneal surface compared with its pre-ReLEx smile value was detected after 3 months, but there was no significant change in keratometric power of the posterior surface. Center of the treated zone of all treated eyes (100%) was within 1.00 mm of decentration from the optical axis; 43 eyes (93%) were within 0.50 mm; and 39 eyes (85%) were within 0.30 mm.
Conclusion	As expected ReLEx smile causes a significant decrease of the anterior corneal keratometry. However,the effect is insignificant at the posterior surface. This study suggests that mild decentration can occur but it is limited. Therefore, excellent visual outcomes can be achieved after ReLEx smile surgery.

Authors 1

Last name	VAN CLEYNENBREUGEL
Initials	H
Department	Mediclinic
City	Oud Heverlee