Myopia surgery has clear indications and contraindications for surgery. Before surgery, we need to pay attention to the following: first, we should first exclude active eye diseases or serious systemic diseases, such as conjunctivitis, keratitis, diabetes, systemic connective tissue diseases, immune function suppression, etc.; second, this surgery is an invasive operation, so it will inevitably bring some small probability of complications, so patients with high expectations for the surgical effect should be cautious about the surgery; third, the age should not be too young Fourth, for the treatment range of myopia, the general requirement is within 1200 degrees; fifth, the corneal curvature should be 39-48D, and the thickness of the cornea should be at least greater than 460μm; sixth, the pupil diameter should not be too large, and if it reaches 7mm and above in the dark room, surgical treatment should be performed with caution or not.