Contact lens

related topics
{@card@, make, design}
{disease, patient, cell}
{acid, form, water}
{math, energy, light}
{company, market, business}
{work, book, publish}
{day, year, event}

A contact lens (also known simply as a contact) is a corrective, cosmetic, or therapeutic lens usually placed on the cornea of the eye. Leonardo da Vinci is credited with describing and sketching the first ideas for contact lenses in 1508[citation needed], but it was more than 300 years later before contact lenses were actually fabricated and worn on the eye. Modern soft contact lenses were invented by the Czech chemist Otto Wichterle and his assistant Drahoslav Lím, who also invented the first gel used for their production.

Some soft contact 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. Some lenses now have a UV protection surface treatment to reduce UV damage to the eye's natural lens.[1]

It has been estimated that 125 million people use contact lenses worldwide (2%),[2] including 28 to 38 million in the United States[2] and 13 million in Japan.[3] The types of lenses used and prescribed vary markedly between countries, with rigid lenses accounting for over 20% of currently-prescribed lenses in Japan, the Netherlands and Germany but less than 5% in Scandinavia.[2]

People choose to wear contact lenses for many reasons, often due to their appearance and practicality.[4] When compared with spectacles, 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.

Contents

Full article ▸

related documents
Glasses
List of counties in Florida
Snowboard
Etching
Racquet
Printmaking
Window
Yo-yo
Longsword
Fountain pen
Mail (armour)
Plywood
Laboratory glassware
Laser printer
Corrugated fiberboard
Chisel
Wing Chun
Stained glass
Knife
Sword
IBM Selectric typewriter
Mexican peso
Inkjet printer
Geodesic dome
Judo
Snowshoe
Corset
Bookbinding
Knitting
Structural engineering