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Introduction of  Contact Lenses

A contact lens ( also known simply as a “contact” ) is a corrective, cosmetic, or therapeutic lens usually placed on the cornea of the eye.

Modern soft contact lenses were invented by the Czech chemist Otto Wichterle, who also invented the first gel used for their production. Contact lenses usually serve the same corrective purposeasconventional glasses, but are lightweight and virtually invisible any commercial lenses are tinted a faint blue to make them more visible when immersed in cleaning and storage solutions.

Some cosmetic lenses are deliberately colored to alter the appearance of the eye.It has been estimated that 125 million people use contact lenses worldwide (2%), including 28 to 38 million in the United Statesand 13 million in Japan.

The types of lenses used and prescribed vary markedly between countries, with rigid lenses accounting for over 20% of currently-prescribed lenses in Japan, Netherlands and Germany but less than 5% in Scandinavia. People choose to wear contact lenses for various reasons.

Many consider their appearance to be more attractive with contact lenses than with glasses. Contact lenses are less affected by wet weather, do not steam up, and provide a wider field of vision. They are more suitable for a number of sporting activities. Additionally, ophthalmological conditions such as keratoconus and aniseikonia may not be accurately corrected with glasses.

Popularity: 14% [?]

Tags: choose contact lenses

This entry was posted on Sunday, May 25th, 2008 at 6:30 am and is filed under Contact Lens Guide. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.