Radial keratotomy

1. Those aged 18 to 20 years old and those with diopter increase of <2.0d in the past two years. 2. Refractive power -2.00d ～ -6.00d. 3. Occupation For those who are engaged in strenuous sports, pilots, firefighting, accounting and microcomputer operations, surgery should be carefully considered. 4. Exclude eye related diseases, such as dry eye, corneal disease, cataract, glaucoma, low intraocular pressure, infectious eye disease and severe intraocular disease. 5. Mental abnormalities should be performed with caution.