Changes in Accommodative Function after Small Incision Lenticular Extraction
Xiaoqin Chen, Yan Wang, Yue Yang, Xiaowen Li, Ruilin Liu, Lihua Li
Tianjin Eye Hospital, Tianjin Key Lab of Ophthalmology and Visual Science, Tianjin Eye Institute, Clinical College of Ophthalmology, Tianjin Medical University, Tianjin 300020, China
Abstract：Objective: To analyze the changes in accommodative function after small incision lenticular extraction. Methods: This was a retrospective study. Twenty-five myopic patients who underwent small incision lenticular extraction (SMILE) surgery from March 2015 to December 2015 at Tianjin Eye Hospital were included in this study. The values of the accommodative parameters including monocular accommodative amplitude (MAA), monocular accommodative facility (MAF), positive relative accommodation (PRA), negative relative accommodation (NRA) and accommodative responses by binocular cross-cylinder (BCC) were measured preoperatively and at 1 week, 1 month and 3 months postoperatively. Comparisons among the different follow-up periods were performed by repeated measures analysis of variance and comparisons between every two periods by the LSD-t test. Results: The MAA had decreased at 1 week but returned to the preoperative level 3 months after the SMILE procedure and the difference was significant (F=5.418, P=0.002). The MAF and PRA had slightly decreased at 1 week but had significantly increased 3 months after surgery (F=8.090, P<0.001; F=5.466, P=0.002). There were no significant differences in BCC or NAR at each observation period preoperatively and postoperatively (F=2.445, P=0.071; F=0.536, P=0.659). Conclusions: SMILE may temporarily reduce accommodative function. However, function reverts back to the preoperative level or even better.
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