OK lenses, also known as keratoplasty lenses, have the benefit of controlling the rapid progression of myopia in patients, but they may also have side effects such as causing corneal edema and eye infections. 1. Benefits: OK lenses achieve the effect of correcting low to moderate myopia and cone cornea by reshaping the corneal surface morphology and reducing the refractive power in the optical zone of the cornea. Patients do not need to wear glasses for a long time, but only need to use them at night when they sleep, with improved naked eye vision during the daytime. Keratoconus can control the rapid development of myopia in patients. 2. Side effects: The corrective effect of OK lenses is reversible, usually wearing can keep the plasticizing effect for 1~2 days. Once stopped, myopia will return to its original level. When used improperly, patients may also experience complications such as corneal edema, infectious keratitis, and papillary conjunctivitis. If the lenses become worn, they may also scratch the patient’s corneal tissue. It is recommended that patients select and standardize the use of OK lenses as needed under the guidance of a doctor, and take good care of their eyes to avoid causing eye diseases.