contact lenses - Hydrogel

Hydrogel is an artificially created hydrophilic (water-binding) material. It is a network of polymers connected by various types of chemical bonds. This material contains a large amount of water; thus, it is highly biocompatible and able to transmit oxygen. Hydrogel itself is not a breathable material, so oxygen is not able to penetrate it. Oxygen molecules are transported through the hydrogel via diffusion through water. Due to their high proportion of water, Hydrogel contact lenses are very comfortable.