[Advances in the research of centration in small incision lenticule extraction].

Small incision lenticule extraction (SMILE) is a new technique that exhibits excellent efficacy, safety and predictability for the correction of myopia and myopic astigmatism. However, one potential limitation of this technique is that the centration during femtosecond laser cutting might be subject to the surgeon's experience and patient's cooperation. To achieve accurate centration in SMILE is the key to obtaining good postoperative visual outcomes. This review summarizes relevant research results and discusses the centration methods and the influencing factors in SMILE, so as to provide reference for clinical practice of SMILE.飞秒激光小切口角膜基质透镜取出术（SMILE）是目前矫正近视眼及散光新的手术方法，具有良好的有效性、安全性和可预测性，但其在飞秒激光切削中心定位方面主要依赖术者的经验和患者的配合，具有一定的局限性，如何使SMILE中心定位准确是术后获得良好视觉效果的关键。本文汇总国内外相关研究结果，探讨SMILE中心定位的方法及其影响因素，以期为临床开展SMILE提供参考。.