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Preoperative & postoperative comparison of higher order aberrations in individuals 1 month after SMILE

Poster Details

First Author: A.Varman INDIA

Co Author(s):    A. Varman                    

Abstract Details


Corneal refractive surgeries are performed with high frequency pulses for safe and accurate tissue ablation . This technique is employed in the flapless refractive surgical procedure, SMall Incision Lenticule Extraction .SMILE has widely replaced conventional refractive surgery. The purpose of this study is to establish whether higher order aberrations are reduced after the SMILE procedure


Uma eye clinic chennai


A retrospective analysis was conducted on 106 eyes underwent SMILE over the past 1 year. All patients who were above the age of 18 years to 32 years. Any patient with a corneal scar, media opacities, coexisting glaucoma or other optic nerve abnormalities, unstable refractive error were excluded from the study. Patients with All patients were evaluated immediately post operatively, post operative day 1, post operative day 8 and post operative day 30.


All patients were subjected to reassessment for Uncorrected Visual Acuity estimation, Post Operative Refraction and iTrace aberrometry on day 1, day 10 and day 30. Mean higher order aberration is significantly (P<0.05) reduced in the post operative status. The mean± SD difference is 124.1 ± 103.7. and the 95% CI of the difference is (83.9 – 164.3.). Mean higher order aberration is significantly (P<0.05) reduced in the post operative status. The mean ± SD difference is 123.8 ± 70.0 and the 95% CI of the difference is (108.1 – 130.7). All analyses were performed with the paired T test.


In our study all patients had a stable vision of 6/6 at the end of day 30. Although it is a known fact that visual acuity and quality of vision is delayed in patients who have undergone SMILE [7,8], in our case scenario we have noticed good recovery of visual acuity and lesser higher order aberrations in all patients postoperatively. This is probably due to lesser energy used and also meticulous surgical handling of the tissues and flap. To conclude SMILE is safe and effective procedure for correction of refractive errors and is also beneficial in reducing higher order aberrations.

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