Comparison of Myopic Astigmatic Correction after cross-assisted SMILE, FS-LASIK, and T-PRK
Yi-Zeng Yang, Fen-Fen Li, Shuang-Qing Wu, Qi Dai, Fang-Jun Bao, Dan Cheng, Jun Zhu, Yu-Feng Ye- Sensory Systems
- Ophthalmology
- Surgery
Abstract
Purpose:
To compare astigmatic correction among cross-assisted small incision lenticule extraction (SMILE), femtosecond laser-assisted in situ keratomileusis (FS-LASIK), and transepithelial photorefractive keratectomy (T-PRK).
Setting:
The Eye Hospital of Wenzhou Medical University, Zhejiang, China.
Design:
Prospective comparison study.
Methods:
This study included 154 right eyes of 154 patients with astigmatism of -1.00 to -2.75 diopters (D). 64, 42, and 48 eyes were receiving SMILE, FS-LASIK, and T-PRK, respectively. The SMILE group used cross-axis alignment for head positioning for astigmatism correction. In the FS-LASIK and T-PRK groups, static and dynamic cyclotorsion control were used. Changes in ocular parameters and vector analysis were assessed six months postoperatively.
Results:
The safety and efficacy indices were comparable among the three groups six months after surgery. Residual astigmatism was smallest in the SMILE group (-0.23±0.25 D) compared to that in FS-LASIK (-0.40±0.28 D, P = 0.009) and T-PRK groups (-0.42±0.32 D, P = 0.001). Respectively, 53 (82.8%), 36 (85.7%), and 37 (77.1%) eyes achieved an angle of error within ±5° (P = 0.55). Notably, vector analysis showed that the difference vector, the magnitude of the error, and its absolute value were significantly smaller in the SMILE group than those in the other groups (P < 0.05). Additionally, the higher-order aberrations, especially coma, were significantly induced after surgery in each group (P < 0.001).
Conclusions:
Residual astigmatism magnitude was smallest by cross-assisted SMILE, followed by FS-LASIK and T-PRK, and the astigmatism axial correction was comparable among groups.