·AIM:To observe the effects of small incision lenticule extraction (SMILE) and trans-epithelial photorefractive keratectomy (Trans-PRK) on corneal horizontal coma, vertical coma, and spherical aberration and total higher order aberrations after refractive correction for myopia. ·METHODS: This was a prospective non-randomized cohort study. The cohort included 40 patients (80 eyes) with myopia, who received refraction correction surgery from December 2016 to February 2017 in Leshan Ophthalmic Center. Twenty patients (40 eyes) received SMILE surgery and the other 20 patients (40 eyes) received Trans-PRK surgery. Corneal aberrations were determined by a high-resolution Pentacam Scheimpflug camera before the surgery and at 1 and 3mo after the operation. Statistical analyses were performed using analysis of variance of repeated measures. · RESULTS: At 1 and 3mo post - operation, the uncorrected visual acuity in both groups was better than or equal to the preoperative best corrected visual acuity. The preoperative corneal aberrations showed no significant difference between the two groups (P>0.05). Significantly higher aberration was found after the surgery in both groups (P 0. 05). Post - operation, horizontal and vertical coma had no significant difference between the two groups (P>0.05), while SMILE group showed lower spherical aberration and lower total higher order aberration than Trans-PRK group (P0.05),术后两组患者角膜像差较术前均增高,差异有统计学意义(P0.05),术后各时间点两组患者水平彗差、垂直彗差之间比较差异无统计学意义(P>0.05),SMILE组患者术后四阶球差及总高阶像差均方根低于Trans-PRK组,差异有统计学意义(P<0.05).结论:SMILE与Trans-PRK手术矫正近视术后角膜像差均增高,两种手术方式对角膜三阶水平彗差和垂直彗差影响相似,SMILE 手术对四阶球差及总高阶像差的影响较Trans-PRK手术更小.
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