Orthokeratology (i.e., OK lenses) is a special type of rigid corneal contact lens eyewear. Patients wear the lenses for 6-8 hours at night and do not need to wear any more glasses during the day, and are able to see very clearly without interfering with outdoor activities. Corneal plastic lenses, the glasses of choice to curb the growth of myopia, are currently the safest and most effective method recognized by the medical community to correct myopia in adolescents. Patients can start by wearing them at night, using the unique shaping base bend of the OK lens to shape the cornea throughout the night to shorten the eye axis; they can also choose not to take them off during the day, using the 14,000 times a day that the human eye blinks continuously to keep squeezing the cornea, effectively shaping a healthy cornea and allowing patients to remove their glasses within a week. It is important to note that the use of keratomileusis is a medical practice and must be worn under the guidance of a professional ophthalmologist or optometrist. Each pair of OK lenses should be “customized” for each myopic patient according to the principle of corneal refraction, and should undergo dozens of procedures such as medical optometry, slit lamp examination, corneal curvature, corneal topography, lens fitting, etc., and should be reviewed regularly after fitting to ensure that the entire treatment process goes smoothly and that irreversible side effects do not occur. side effects.