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 ?
I believe it is our duty to explain the importance of appropriate contact lens supply, fitting and aftercare.
Three bottles of each contact lens solution were evaluated using a single-blind controlled experiment method.
Multistate outbreak of Fusarium keratitis associated with use ofa contact lens solution.
Clients can visit Fairmont Optical directly to achieve a complete fitting from an experienced contact lens fitting specialist.
Acuvue has also been actively visiting universities and high schools in the UAE and Saudi Arabia to provide students with vision checks and complimentary Acuvue Contact Lens fitting trials.
They then rated contact lens comfort and other symptoms during the two periods.
1Following the contact lens care guidelines from their optician
09 million to establish a plant in the Central Taiwan Science Park to fabricate contact lens, adding that the contact lens market is growing in Taiwan and China, with contact lenses made in Taiwan selling at higher prices than those made in China.
This month's featured continuing education lesson focuses on what pharmacists should know about proper contact lens care and the use of newer contact lens care systems.
If you're not a contact lens wearer, however, your best bet is to buy wrap-around sunglasses that transmit no more than one percent UVB and UVA rays.
Tokyo, Japan, Jan 13, 2006 - (JCN) - Japanese contact lens manufacturer Seed has announced its plan to build a new contact lens production plant in Konosu, Saitama Prefecture.
The START project's key activities are the following animal and human contact lens trials: