Keratoplasty is a special kind of RGP lenses. Regular RGP lenses are used to correct vision, while orthokeratology lenses are used for "orthopedic" purposes, i.e., to improve vision by changing the curvature pattern of the front surface of the cornea. Ordinary RGP lenses have an inner surface that is parallel to the surface of the cornea, coinciding with each other, and the change in curvature of the lens is used to adjust the lightness of the lens. Plastic lenses are the opposite. The outer surface is simpler and the inner surface is more complex. The inner surface of Orthokeratology is no longer parallel to or coincides with the cornea, but creates gaps between the lenses and the cornea, utilizing the surface tension of tears and the siphoning effect of the lenses to achieve an "orthopedic" effect. Keratoplasty lenses (OK lenses) are hard contact lenses made of special materials, which have much higher gas permeability and oxygen permeability than ordinary contact lenses. In addition, OK lenses are worn at night while you sleep, and you don't wear glasses during the day, so the service life of OK lenses is much longer, and a pair of OK lenses can be used for about 1.5 years.
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