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Contacts can come in a number of multiplicity, including hard and soft. Hard contacts are typically not disposable, while soft contacts often are. Some soft contacts are also known as extended wear lenses. Contact lenses (both soft and hard) are made of various types of polymers, usually containing some variant of silicone hydro gel. Beforehand, hard contact lenses were made of a polymer known as PMMA. They have since been replaced by rigid gas-permeable (RGP) contact lenses. Many contact lenses are made of hydrophilic (water-absorbing) materials, thereby allowing oxygen to reach the cornea, and make the lens more comfortable to wear.

There are two types of wide-ranging contact lenses. Soft lenses and rigid gas permeable lenses are the two types of lenses. The rigid gas permeable is also known as RGP. Soft contact lenses are easier to wear because they are more moveable than that of RGP. This makes them more comfortable to have in your eyes. The soft lens also allows oxygen flow freely to your cornea leaving your eyes feel better. Rigid gas permeable contact lenses are sturdier and give you better sight making things look clearer.