Chemical composition of contact lenses

Contact
lenses can be categorized as soft conventional hydrogel, silicone hydrogel, or
rigid gas permeable contact lenses. According to Contact Lens Spectrum, all
contact lenses utilize a polymer backbone. A polymer is a chemical chain formed
from linking many smaller molecules.

 

Soft Conventional Hydrogel

o  Soft
conventional hydrogel contact lenses share a common backbone of the polymer
polyHEMA. This polymer serves as the base for all soft contact lenses, and
different brands are formed by injecting differing amounts of water and other
chemicals into the contact lens as it is manufactured.

 

Silicone Hydrogel

o  Silicone
hydrogel contact lenses are also known as breathable contact lenses. These
contact lenses can be worn overnight in some cases. Silicone rubber is used as
the polymer backbone in silicone hydrogel contact lenses. Other chemicals, such
as polydimethylsiloxane, are also added to improve comfort.

Rigid
Gas Permeable

o  Rigid
gas permeable contact lenses are also known as hard contact lenses. Rigid gas
permeable contact lenses contain differing amounts of methyl methacrylate,
fluorine, silicon and other chemicals to make them comfortable to wear.
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