Night Wear RGP, or Ortho-K, is a special type of RGP lens designed by Dr. Thomas Reim, founder of Ortho-K, based on the principles of keratomileusis correction. Corrective principle Night-wear RGP through the mechanical compression effect of the lens, eyelid massage effect and hydraulic action mechanism, so that the central area of the cornea gradually flattened, the paracentral area of the cornea gradually steepened, so as to change the refractive power of the cornea, in the short term to achieve the effect of reducing myopia. Long-term use can control the rapid growth of the eye axis and slow down the development of myopia. Domestic and international studies show that the control ability of OK lenses on myopia is about three times that of ordinary frame lenses. Features of night-wear RGP 1, safety: the lenses have ultra-high oxygen permeability (DK value〉140) material made to meet the need for corneal oxygen exchange. 2.Strict system: receiving this correction needs to be tested by matching ophthalmic precision instruments, the whole process is carried out under the operation of trained professionals, and the lenses are made by aerospace material technology with high precision. 3, no incision, no pain: no damage to the cornea, only the corneal reshaping, correcting refractive errors. 4, reliable effect: generally 2 weeks to 3 weeks to reduce myopia 300 degrees – 500 degrees, and gradually achieve the effect of consolidation and stability, while effectively curbing the myopia deepening. 5.Easy to use: Only wear it for 8-10 hours at night while sleeping, and take it out the next morning, so that you can keep clear vision all day without glasses. 6, wide use: generally 8 – 40 years old can receive correction, especially myopia 600 degrees or less, astigmatism is not more than 1/2 of the myopia of adolescents, the best effect. Tips: Not all teenagers are suitable for keratoplasty, and must undergo a strict examination and evaluation.