Contact Lens

"A contact lens (also known as "contact", for short) is a corrective or cosmetic lens placed on the cornea of the eye atop the iris.

A soft contact lens

Contacts can come in a number of varieties, 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. The most commonly used contact lenses today are of the soft variety, invented in 1961 by the Czech chemist Otto Wichterle (1913–1998).

Contact lenses (both soft and hard) are made of various types of polymers, usually containing some variant of silicone hydrogel. Previously, 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 They have since been replaced by rigid gas-permeable (RGP) contact lenses.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.

Heavily tinted contacts are tinted to change the color of the iris, and are used for cosmetic reasons. Some standard contact lenses are slightly tinted in order to make them more visible for handling purposes." - www.wikipedia.org

Generally, there are two types of contact lens:

• Hard Lens
• Soft Lens

While soft lens is suitable for most people, there are situations where soft lens is not suitable. For example, keratoconus patients, post LASIK patients, and people with dry eyes. If you are one of those who cannot wear soft lens, then you might need to try hard lens or semi hard lens like Rigid Gas Permeable (RGP) lens.