Dry eye after excimer surgery is a common problem. The main reason for the occurrence of dry eye after surgery is that during excimer surgery, the production of corneal flap and the cutting of matrix cut off the sensory nerve of part of the cornea, reducing the sensory and neurotrophic functions of the cornea, leading to the reduction of reflective tear secretion and the number of blinks, which leads to the reduction of the amount of tear secretion and the stability of the tear film. The study found that the corneal nerve after surgery can be restored to the preoperative level after 6-9 months of regeneration and repair. Therefore, dry eye may be obvious at the early stage after surgery, but it will gradually reduce with corneal repair until it returns to normal.