Contact lenses are classified as corrective, therapeutic, and cosmetic. For those who are short sighted, near sighted, or who have astigmatism (all refractive defects of the eye) corrective contact lenses are in order. In these cases, an eye patient will mostly likely be prescribed spherical lenses. Therapeutic contact lenses cure other problems that are non refractive, like dry eye, and some types of therapeutic lenses even deliver medicine to the eye.

Two types of cosmetic lenses are colour contact lenses and special effects contact lenses. While these lenses occasionally correct vision when needed (they are basically spherical lenses), they also can blur vision because of their design. Colour contact lenses essentially change the appearance of the eye.

Some people might require colour contact lenses for less superficial reasons (perhaps they have a physical deformity on their iris) while others might simply want to ditch their natural brown eye color for a more appealing blue. Natural shades like hazel or blue are acquirable but so are wilder colors like purple. A subtler colour contact lens is the tinted lens, which enhances one’s natural eye color, as opposed to drastically changing it.

It is important that a mortal finds colour contact lenses that suit their natural features though; otherwise their eyes might look strange.

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