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. 2016 Sep 7;6:32820. doi: 10.1038/srep32820

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Refractive outcomes by 6 months: Percentages of eyes within different diopter ranges of the intended correction in spherical equivalent (A) (grey = SMILE, white = PRK), and percentage of eyes attaining specified levels of astigmatism before and after small-incision lenticule extraction (B) and photorefractive keratectomy (C) (grey = preoperative, white = postoperative).