Objective To investigate the incidence of retinal break before LASIK operation on myopia.Methods By direct ophthalmoscope,Goldmann three mirror contact lens and indirect ophthalmoscope,the peripheral retinal degeneration or retinal hole of 993 eyes from 506 patients with myopia were detected and conducted photocoagulation before LASIK.Results Retinal degeneration in 354 eyes(35.65%) and retinal break in 83 eyes(8.36%) were discovered from 993 eyes.The occurrence rate of retinal break was 10.24% in 449 eyes ...