l What are OK lenses? Answer: Orthokeratoloy Lens. keratoplasty lenses are worn at night and improve vision significantly the next day. Short-term vision improvement, reversible effect. It has the effect of inhibiting the development of progressive myopia in adolescents. Use of RGP material with high oxygen permeability causes little to no corneal damage or dry eye. l What is RGP? Answer: Rigid Gas Permeable Contact Lens. Daytime wear. Very good biocompatibility. High clarity, can control myopia, astigmatism deepening, especially the youth myopia can be slowed down by it, for early cone cornea and cone corneal tendency to have a therapeutic and slowing effect. What is the role of OK lenses and RGP? Answer: First, to obtain clearer vision. Second, to control the progression of myopia. Third, to control the progression of corneal lesions such as cone keratoconus. l Are OK lenses and RGP “Dr. Lomb contact lenses”? Answer: No, they are not. ”They are soft contact lenses that are not suitable for children and have no therapeutic effect. Although OK lenses and RGP are also corneal contact lenses, they are made of special high-tech materials and are the safest and most effective way to control myopia. How old are OK lenses and RGPs for children? Answer: They can be worn by infants from a few months old to adults. If you want to control the progression of myopia in adolescents: 6~7 years old If you have cataract surgery without a lens, or treatment of high refractive error amblyopia: it is recommended to wear them from the onset. What kind of children are suitable for OK lenses? Answer: Early age of myopia onset, or progressive myopia. It is recommended to wear spherical lenses <5.5d; column lenses <1.5d.< span=""> l What kind of children are suitable for RGP? Answer: Children with high refractive error. Or children who are not suitable for OK lenses. What is the principle of OK lenses and RGP for myopia control? Answer: The principle is very complicated. The following mechanisms are speculated: Mechanism 1: Mechanical pressure. Mechanism 2: The effect of obtaining better vision and reducing peripheral defocus. l Are there any disadvantages to OK lenses and RGP? Answer: Yes, there are. Disadvantage one: expensive, currently the price of OK lens and RGP are thousands of dollars to ten thousand dollars. Disadvantage 2: They need to be taken off and cleaned daily, and parents need to take them off daily for children under 10 years old. Disadvantage 3: Regular follow-up visits to the hospital are required. Lenses need to be replaced every year. Can I buy OK lenses and RGP from an optical store? Answer: No, you cannot. OK lenses and RGPs are medical devices. They must be fitted, made, and followed up strictly. Inappropriate wear may lead to eye infections, and serious infections that are not treated in time will lead to corneal ulcers and endophthalmitis. Therefore, the state clearly stipulates that OK lenses and RGP cannot be used for commercial sale.