Idea to apply the lenses, which would contact eyes, is not new. However, contact lenses gained wide popularity only in the end of 50th years of the last century.
The first contact lenses were quite thick, that often caused distortion of visual perception. However, now contact lens represents thin transparent sphere, which after applying it, is approximately practically imperceptible and is felt by its owner only during the first week. In comparison with glasses, contact lenses have a number of advantages: they are imperceptible, do not limit a field of vision, expand opportunities of playing sports and allow the person to lead active way of life without any restrictions.
There are such types of lenses:
1. Optical contact lenses - these lenses are applied for correction of defects of look;
2. Cosmetic contact lenses - these lenses are applied for correction of various congenital, or got as a result of trauma, defects of eyes;
3. Contact lenses for playing sports. Recently large manufacturers of contact lenses have started to develop special lenses for separate kinds of sports. For example, there are lenses, which selectively increase contrast of recognition of yellow color of ball for playing tennis and softball.
4. Decorative contact lenses - these lenses are applied for strengthening natural color of eyes, or for its radical change. Except for aesthetic functions, decorative contact lenses can also carry out correction of sight. Manufacturers of contact lenses offer various colors of lenses colors - “radical” tones and calm tones. For especial originals there are contact “crazyâ€? lenses with various figures or effects. These lenses are used, mainly, in the movie-industry for creation of vampires eyes, aliens and other characters with unusual eyes.