Clinically, it was found that some patients missed diagnosis because of incomplete preoperative examination and could not be treated in time, which led to postoperative complications. For example, fundus examination must fully examine the peripheral retina, because the peripheral retina of patients with high myopia is prone to degeneration or dry holes. If the operation is not found in time, the patient is likely to have serious blinding diseases such as retinal detachment after operation. If retinal detachment can be found in time and given preventive fundus laser treatment, the occurrence of retinal detachment can be prevented, and laser surgery for myopia is still feasible after recovery. Therefore, whether it is binocular refractive surgery or monocular surgery, a comprehensive and detailed preoperative examination is needed.

Generally speaking, the cost of monocular surgery will vary according to the different surgical methods. Generally, the cost of monocular surgery in mainstream femtosecond laser surgery is between 7000- 10000 (including the cost of preoperative examination), depending on whether there is astigmatism and other eye conditions. According to the choice of surgery, the prices of different cities and hospitals also have some differences.