1.Visual acuity examination (bare eye vision, corrected visual acuity, near vision) to understand the vision before surgery; 2.IOP measurement to exclude glaucoma; 3.Dilated pupil to prepare for optometry and fundus examination; 4.Slit lamp examination to check the situation of the anterior segment of the eye; 5.Fundus examination to check the vitreous, retina and optic nerve; 6.Optometry; 7.Corneal topography examination to exclude cone cornea and verify the patient’s astigmatism 8.Ultrasound corneal thickness examination to accurately check the thickness of the cornea; 9.Tear test to rule out dry eye; 10.Wavefront aberration examination.