Posters

Long-term observation of posterior corneal elevations after SMILE and FS-LASIK for myopia higher than -10 diopters

Poster Details

First Author: X.Zhou CHINA

Co Author(s):    J. Shang   B. Qin   Y. Zhao   X. Zhou           

Abstract Details

Purpose:

To investigate the long-term change in posterior corneal elevations (PCEs) of eyes with extremely high myopia after small incision lenticule extraction (SMILE) and femtosecond laser–assisted LASIK (FS-LASIK)

Setting:

Eye and ENT Hospital of Fudan University

Methods:

We evaluated thirty-nine eyes of 39 patients with spherical equivalent higher than  10.00 diopters (D). Using a Scheimpflug camera (Pentacam), we measured change in PCEs at 1 day, 3 months, 6 months and 2 years after SMILE. Another thirty-four eyes of 34 patients who underwent FS-LASIK were examined before, at 1 day and long-term after surgery as the control group. For each eye, elevations at central, thinnest, maximal points and 24 other predetermined points were measured.

Results:

No significant forward displacements of PCEs were observed in both surgeries. The maximal but not significant forward displacement occurred around 3-6 months following SMILE, and all returned to original levels 6 months postoperatively except superior area. In both procedures, elevations along horizontal meridians, inferior and temporal hemispheres were significantly higher than those along vertical meridians, superior and nasal hemispheres, respectively (p < 0.05). Elevation on the 4-mm, 6-mm diameters at 1 day, and on the 6-mm diameter and temporal hemisphere at long-term follow-up postoperatively were significantly higher in FS-LASIK than SMILE (p < 0.05).

Conclusions:

Both SMILE and FS-LASIK are safe ways to correct for myopia over -10 D, with PCEs remaining stable long-term postoperatively. SMILE shows some advantages over FS-LASIK on posterior surface stability.

Financial Disclosure:

None