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PLoS One. 2015 Apr 7;10(4):e0123408. doi: 10.1371/journal.pone.0123408. eCollection 2015.

Comparison of astigmatic correction after femtosecond lenticule extraction and small-incision lenticule extraction for myopic astigmatism.

Author information

1
Department of Ophthalmology, University of Kitasato School of Medicine, Kanagawa, Japan.
2
Department of Ophthalmology, University of Kitasato School of Medicine, Kanagawa, Japan; Department of Ophthalmology, Faculty of Medicine, Minia University, Minia, Egypt.
3
Department of Ophthalmology, Faculty of Medicine, Minia University, Minia, Egypt.

Abstract

PURPOSE:

To compare postoperative astigmatic correction between femtosecond lenticule extraction (FLEx) and small-incision lenticule extraction (SMILE) in eyes with myopic astigmatism.

METHODS:

We examined 26 eyes of 26 patients undergoing FLEx and 26 eyes of 26 patients undergoing SMILE to correct myopic astigmatism (manifest astigmatism of 1 diopter (D) or more). Visual acuity, cylindrical refraction, the predictability of the astigmatic correction, and the astigmatic vector components using Alpin's method, were compared between the two groups 3 months postoperatively.

RESULTS:

We found no statistically significant difference in manifest cylindrical refraction (p=0.74) or in the percentage of eyes within ± 0.50 D of their refraction (p=0.47) after the two surgical procedures. Moreover, no statistically significant difference was detected between the groups in astigmatic vector components, namely, surgically induced astigmatism (0.80), target induced astigmatism (p=0.87), astigmatic correction index (p=0.77), angle of error (p=0.24), difference vector (p=0.76), index of success (p=0.91), flattening effect (p=0.79), and flattening index (p=0.84).

CONCLUSIONS:

Both FLEx and SMILE procedures are essentially equivalent in correcting myopic astigmatism using vector analysis, suggesting that the lifting or non-lifting of the flap does not significantly affect astigmatic outcomes after these surgical procedures.

PMID:
25849381
PMCID:
PMC4388708
DOI:
10.1371/journal.pone.0123408
[Indexed for MEDLINE]
Free PMC Article

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