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Vienna 2018 Delegate Registration Programme Exhibition Virtual Exhibition Satellites 2018 Survey


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Comparison of visual and refractive outcomes between transepithelial PRK and small incision lenticule extraction

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Session Details

Session Title: SMILE vs PRK, Ocular Surface Disease

Session Date/Time: Monday 24/09/2018 | 08:00-10:30

Paper Time: 08:50

Venue: Room A3, Podium 3

First Author: : L.Hu CHINA

Co Author(s): :    H. Zhou   Z. Hu   M. Lin   J. Huang   F. Lu        

Abstract Details


To compare the visual and refractive outcomes of transepithelial photorefractive keratectomy(t-PRK) with small incision lenticule extraction (SMILE) in terms of visual acuity, aberrations and contrast sensitivity(CS).


The study was prospectively conducted from January 2017 to August 2017, among patients at the Eye Hospital of Wenzhou Medical University.


72 eyes treated with SMILE and 60 eyes treated with t-PRK were rolled in this study. Visual acuity, subjective manifest refraction, aberrations and CS before and 1month, 3months, 6 months after the surgery were analyzed for both groups. Total HOAs, spherical aberrations, coma and trefoil were calculated over the 4-mm-diameter central corneal zone.


6 months after surgery, the mean SE was 0.13±0.38D in the t-PRK group and 0.18±0.38D in the SMILE group (p = 0.48). 87% of t-PRK eyes and 90% of SMILE eyes had an uncorrected distance visual acuity of 0 logMar or better (p = 0.85). Further-more, Total HOAs, spherical aberration, coma and trefoil increased postoperatively in both groups. However, there was no statistically significant difference between the groups preoperatively and postoperatively except spherical aberration in 1 month(p<0.05). As to CS, 18c/d CS in t-PRK group was higher than SMILE group after 6 months.


After 6 months follow-up, t-PRK and SMILE result in comparable refractive results. In addition, corneal aberrations induced by different techniques seemed similar. The contrast sensitivity after t-PRK may be slightly better compared to SMILE.

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