Zhang Hui, Wang Yan, Li Hua
Clinical College of Ophthalmology, Tianjin Medical University, Tianjin 300020, China.
Tianjin Eye Hospital, Tianjin 300020, China.
J Ophthalmol. 2017;2017:4921090. doi: 10.1155/2017/4921090. Epub 2017 Aug 27.
To investigate corneal spherical aberration and corneal asphericity after small incision lenticule extraction (SMILE) and femtosecond laser-assisted laser in situ keratomileusis (FS-LASIK).
This study enrolled 70 patients having SMILE and 64 subjects receiving FS-LASIK. The preoperative spherical equivalent (SE) was -5.83 ± 1.23 diopters (D) and -6.20 ± 1.52 D, respectively. The uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), SE, corneal spherical aberration, and asphericity over the 6.0 mm cornea were evaluated preoperatively and postoperatively.
At 6 months, the UDVA, CDVA, and SE were -0.12 ± 0.11, -0.05 ± 0.05, and -0.16 ± 0.19 D in SMILE and -0.10 ± 0.06, -0.03 ± 0.06, and -0.08 ± 0.25 D in FS-LASIK. There was no difference between groups in the postoperative UDVA, CDVA, or SE ( > 0.05). SMILE showed lower inductions of spherical aberration along the anterior surface and the total cornea and less increases in corneal asphericity of the anterior surface postoperatively than FS-LASIK ( < 0.01). There were significant correlations between the changes in spherical aberration and corneal asphericity ( < 0.001).
SMILE and FS-LASIK exhibited excellent visual results and refractive outcomes. SMILE induced less increase in corneal spherical aberration and better preserved the corneal asphericity of the anterior corneal surface than FS-LASIK. Corneal asphericity changes contributed to the corneal spherical aberration changes following SMILE and FS-LASIK.
研究小切口透镜切除术（SMILE）和飞秒激光制瓣准分子原位角膜磨镶术（FS-LASIK）术后的角膜球差和角膜非球面性。
本研究纳入70例行SMILE的患者和64例接受FS-LASIK的受试者。术前等效球镜度（SE）分别为-5.83±1.23屈光度（D）和-6.20±1.52 D。术前和术后评估未矫正远视力（UDVA）、矫正远视力（CDVA）、SE、角膜球差以及6.0 mm角膜上的非球面性。
6个月时，SMILE组的UDVA、CDVA和SE分别为-0.12±0.11、-0.05±0.05和-0.16±0.19 D，FS-LASIK组分别为-0.10±0.06、-0.03±0.06和-0.08±0.25 D。两组术后UDVA、CDVA或SE无差异（P>0.05）。与FS-LASIK相比，SMILE术后前表面和全角膜的球差诱导较低，前表面角膜非球面性增加较少（P<0.01）。球差变化与角膜非球面性变化之间存在显著相关性（P<0.001）。
SMILE和FS-LASIK均表现出优异的视觉效果和屈光结果。与FS-LASIK相比，SMILE引起的角膜球差增加较少，且更好地保留了角膜前表面的非球面性。角膜非球面性变化导致了SMILE和FS-LASIK术后的角膜球差变化。
