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Does small incision lenticule extraction induce astigmatism after correction of myopia?

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Session Details

Session Title: Small Lenticule Extraction

Session Date/Time: Tuesday 25/09/2018 | 08:00-10:30

Paper Time: 09:24

Venue: Room A3, Podium 3

First Author: : A.Ivarsen DENMARK

Co Author(s): :    J. Hjortdal                    

Abstract Details


To examine whether small incision lenticule extraction (SMILE) for myopia induces corneal astigmatism.


Department of ophthalmology, Aarhus University Hospital


A total of 346 eyes (175 right eyes) of 346 patients (119 female) were treated for myopia without concurrent astigmatism. SMILE was performed with a 500 kHz Visumax femtosecond laser. Patients were examined before and 3 months after surgery with autorefraction, subjective refraction, and Pentacam HD. Cylinder data was evaluated by vector analysis.


Average preoperative spherical equivalent refraction was -7.34 +/- 1.44D, mean preoperative subjective cylinder was -0.05 +/- 0.11D, while the mean keratometric cylinder was -0.53 +/- 0.31D. The mean postoperative spherical equivalent refraction was -0.29 +/- 0.47D, subjective cylinder averaged -0.36 +/- 0.34D and the mean keratometric cylinder was 0.74 +/- 0.44D. Using vector analysis an average surgically induced keratometric astigmatism of 0.42 +/- 0.28D @95 degrees was observed (p<0.001), similar to an induced subjective astigmatism of 0.36 +/- 0.33D @97 degrees.


Correction of myopia with SMILE induces approximately 0.40 D of with-the-rule astigmatism.

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