Contact lens comprises of two types of products, such as soft lens and gas permeable lens. Soft lenses are made of plastics and allow oxygen to pass through the eye cornea. They use materials that are translucent and flexible such as silicone hydrogel, that are high on oxygen permeability and are high on water retention capacity which makes them extremely comfortable for prolonged wear. At present, soft lenses have high oxygen permeability factor. More
