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Hydrogel, refractive index 1.433-1.440, oxygen permeability coefficient (DK value) 10 0 degree contact lenses, Contact lenses for myopia, Custom eyeglass lenses Oxygen metabolism 1. Cornea and oxygen 80% of the oxygen required by the cornea comes from air, 15% from the corneal limbal vascular network and 5% from aqueous humor. Corneal hypoxia can cause different manifestations, such as corneal edema, decreased vision, decreased nerve end sensation, limbal vascular hyperplasia, and decreased corneal epithelial and endothelial function, etc. Wearing soft contact lenses while open eyes, the oxygen supply of the cornea mainly comes from air, while wearing soft contact lenses made of hydrogel material during sleep, the cornea cannot obtain sufficient oxygen supply, resulting in corneal hypoxia. 2. Factors that determine oxygen permeability of contact lenses Water content/thickness/material/old and new lenses/tightness, etc 3. Several terms about the oxygen permeability of contact lenses Oxy…

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