What Are Contact Lens Made Of

 

Soft contact lenses are made of plastic, but not the type of plastic used in garbage bags or paper plates. Instead, soft lenses are made of hydrophilic plastics - a special type of water-absorbing plastic that stays soft and moist as long as it is absorbing lots of water, made of cast moulding technology.

As long as that plastic stays nice and wet either inside our eye or in a case, the plastic stays pliable and soft. To our eyes, this soft flexibility spells comfort. When our eyes are dry, our lenses will begin to feel uncomfortable because they depend on moisture to keep them in place and pliable.

Soft contact lenses are categorized by the amount of water they contain. They can be classified as either high water or low water. Most extended wear contact lenses are made out of silicone hydrogel - a material that combines the water-absorbing plastic of soft lenses with silicone. Adding silicone to the hydrogel plastic creates cast moulding contact lenses that stays moist and allows more oxygen to transmit through the contact lens into the eye.

Rigid gas permeable lenses (RGP lenses) are also made of plastic by the Turkey contact lens manufacture. Unlike the plastic that makes a soft contact lens, the rigid gas permeable lens transmits oxygen without absorbing water. Instead, RGP lenses have microscopic holes in them that allow the oxygen to filter through. For this reason, RGP lenses are classified by their oxygen permeability instead of their water content. Most RGP lenses are now made of three main materials: acrylate, silicone and fluorine.

For more details on this, please browse www.cltech.com.sg.