5.Aqua blue plate contact lenses\0 degree contact lenses\Myopia color contact lenses\Aqua blue plate contact lenses

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
Oxygen permeability coefficient DK value D - diffusion coefficient K - dissolution coefficient The higher the water content, the higher the DK value
Oxygen conductivity DK /T- the ability of oxygen to pass through a specific lens of a certain thickness
Isooxy EOP - the percentage of oxygen between the lens and the cornea
Without glasses, the oxygen available to the human cornea is 21%, that is, EOPMAX=21%
International Association of Contact Lens Educators - Daily Lens DK /T greater than 24, EOP greater than 12%
Long lens DK /T is greater than 87, EOP is greater than 18%

November 30, 2024