Decentration is a common postoperative complication of excimer laser corneal refractive surgery, and severe decentration can result in the decline of UCVA and BCVA and visual symptoms such as glare, halo, monodiplopia, irregular astigmatism and ocular higher order aberrations increased and thus affect the patients′ visual quality and operation effects. Decentrantion also exists in small incision lenticule extraction (SMILE). The article is about causes, clinical manifestation, prevention and treatment of decentration, and it also does good for the studying of the decentration in SMILE.
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