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A three-year observation of corneal backscatter after small incision lenticule extraction

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Session Details

Session Title: SMILE, LASIK and Re-treatment

Session Date/Time: Monday 09/10/2017 | 14:30-16:00

Paper Time: 14:36

Venue: Room 2.1

First Author: : X.Zhou CHINA

Co Author(s): :    T. Han   J. Zhao                 

Abstract Details


To investigate changes in corneal backscatter after small incision lenticule extraction (SMILE).


Retrospective comparative study.


One eye was randomly selected from 34 patients who underwent SMILE procedures. Corneal backscatter was analyzed using Scheimpflug technology before surgery and at postoperative 1 day, 1 week, 1 month, 3, 6, 12 months and 3 years. Three different corneal depths (the anterior 120 μm, the center, and the posterior 60 μm) and three concentric radial zones (0-2 mm, 2-6 mm, and 6-10 mm) were analyzed. Another 40 eyes of 40 patients who underwent femtosecond laser-assisted LASIK (FS-LASIK) were examined before surgery and at postoperative 1 day and 3 years as the control group.


t postoperative day 1, a significant increase was detected in the SMILE group compared to preoperative values in the central 0-6 mm zones of the anterior layer and the 0-2 mm zone of the central layer (P< 0.01). This increase was higher than that in the FS-LASIK group in the central 0-6 mm zones of the anterior and central layers (P< 0.01). Compared to preoperative values, no significant differences were detected at 1-week, 1, 3, 6, and 12-month follow-ups after SMILE, and a significant decrease was detected in all zones in both groups at postoperative year 3 (P < 0.001).


Corneal backscatter peaks and declines to the baseline in the early period after SMILE procedures and corneal transparency achieves an improvement within postoperative three years.

Financial Disclosure:


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