contact lens


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contact lens,

thin plastic lens worn between the eye and eyelid that may be used instead of eyeglasses. Actors, models, and others wear them for appearance, and athletes use them for safety and convenience. Contact lenses may also be used to correct certain abnormalities of the eye that cannot be corrected by regular glasses. A. E. Fick, a Swiss physician, made the first contact lens in 1887. His heavy glass lenses exerted an uncomfortable pressure on the eyeball, covered the entire eye surface, and were difficult to fit. In 1938, the first plastic contact lens was made by Theodore E. Obrig, using a newly discovered methylmethacrylate plastic, known as Plexiglas or Lucite, that could be molded into the proper shape. The major drawback was that a solution placed between the lens and eye had to be changed every few hours, because the wearer's tears could not circulate beneath the lens. In 1950, the corneal contact lens was introduced. It covered only the cornea of the eye, floated on the tears of the wearer, and could be worn all day without difficulty. Recent improvements include flexible lenses that shorten the initial period of adjustment for the wearer and porous lenses that do not have to be removed each day. Today, contact lenses that "breathe" have become popular. They allow oxygen to get to the cornea, preventing blurred vision due to the corneal exhaustion syndrome.

contact lens

[′kän‚takt ‚lenz]
(optics)
A thin lens fitted over the cornea to correct defects of vision.
A similar lens or prism used with a gonioscope in eye examinations.

contact lens

a thin convex lens, usually of plastic, which floats on the layer of tears in front of the cornea to correct defects of vision
References in periodicals archive ?
National outbreak of Acanthamoeba keratitis associated with use of a contact lens solution, United States.
In order to prevent damages from contact lens, it is always recommended to follow the advice of your ophthalmologist which includes details about how long to wear it and how frequently to replace it.
Survey results showed that contact lens wearers preferred DAILIES TOTAL1 water gradient contact lens over their regular brand by a ratio of 13 to 118.
The ministry attributed much of the gains to the top-notch R and D efforts of domestic contact lens companies.
aeruginosa may display resistance to antibiotics if assosiated with contact lens. [4-6] Studies have shown that the use of contact lenses increases adherence of P.
residents use contact lenses and in 2014, nearly all of contact lens wearers surveyed reported at least one behavior that puts them at risk for a contact lens-related eye infection.
Linking it to self-confidence, close to 60% of contact lens users wear them to feel accepted and blend with the peers.
Nottingham, United Kingdom, June 09, 2016 --(PR.com)-- As stated in a recently published information by Brisk Insights Contact Lens Technology Market is expected to grow at the CAGR of 10.6% during 2015-2022.
Three giant tech companies have unveiled their breathtaking plans to engineer their own smart contact lens for unique purposes.
Almost all of the 41,000,000 estimated contact lens wearers in the U.S.