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Early visual outcomes and optical quality after femtosecond laser small‐incision lenticule extraction for myopia and myopic astigmatism correction of over −10 dioptres
Author(s) -
Qin Bing,
Li Meiyan,
Chen Xun,
Sekundo Walter,
Zhou Xingtao
Publication year - 2018
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/aos.13609
Subject(s) - small incision lenticule extraction , scheimpflug principle , ophthalmology , medicine , corneal topography , aberrations of the eye , coma (optics) , astigmatism , visual acuity , spherical aberration , keratomileusis , femtosecond , keratometer , optometry , cornea , laser , lens (geology) , optics , physics
Purpose To investigate early visual and refractive outcomes, corneal stability and optical quality after femtosecond laser small‐incision lenticule extraction ( SMILE ) for treating myopia and myopic astigmatism over −10 D. Methods Thirty eyes (30 patients) with myopia and myopic astigmatism of over −10 D were treated with VisuMax ® femtosecond laser (version 3.0; Carl Zeiss Meditec AG, Jena, Germany). Six months postoperative safety, efficacy and predictability were evaluated. Corneal Scheimpflug topography was measured preoperatively, 1 day, 3 months and 6 months postoperatively. Wavefront aberrations were measured preoperatively, 3 months and 6 months postoperatively. Results Six months postoperatively, Log MAR uncorrected and corrected distance visual acuity ( CDVA ) were −0.013 ± 0.086 and −0.073 ± 0.069, respectively. 73% (97%) of eyes were within 0.5 (1) D of target refraction. No eyes lost CDVA , 43% (13 eyes) gained one line and 7% (two eyes) gained two lines. Mean corneal back curvature ( KMB ) and posterior central elevation ( PCE ) did not change significantly comparing preoperative and 6 months postoperative data (p = 0.91 and 0.77, respectively). Comparing 1 day with 6 months postoperative data, central corneal thickness ( CCT ), mean corneal front curvature ( KMF ), KMB and PCE did not change significantly (p = 0.27, 0.07, 0.52, 0.71, respectively). Total higher‐order aberration (HOA), spherical aberration and coma increased significantly (p < 0.01) but trefoil remained stable (p = 0.49). Conclusion Our results indicate that SMILE can correct myopia and myopic astigmatism of over −10 D predictably. No early ectasia was observed. Long‐term changes in visual quality and corneal stability require further investigation.