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 ?
27, 2015 /PRNewswire/ -- Today, in continued recognition of the Centers for Disease Control and Prevention's (CDC) Contact Lens Health Week, 1-800 Contacts is providing an overview on contact lens solution and how to best use it to keep lenses clean.
They inquire whether the geographic pattern of AK outbreak-associated cases coincides with distribution of [greater than or equal to]1 manufacturing plants for the associated product, Complete MoisturePlus (CMP) multipurpose contact lens solution (Advanced Medical Optics [AMO], Santa Ana, CA, USA).
No use of contact lens solutions other than AMOCMP was identified as a risk factor, including the 1 other multipurpose solution that contained propylene glycol.
It is the size of a make-up compact and has a left and right compartment containing a sealed, sterile and hydrating multipurpose contact lens solution produced by the manufacturer the Ote Group.
In remarks to the FDA today, the organizations recommend that the FDA work closely with industry to expand and strengthen contact lens solution and product testing to better protect consumers.
That ingredient in concentrations routinely used by AMO and Allergan has been shown to be ineffective against Acanthamoeba in many published studies," says Moore, who added that if AMO wants to take a leadership position in the contact lens solution industry, "they should develop a disinfectant that works, and stop blaming consumers for infections which could be prevented with effective products.
THE MEDICINES and Healthcare products Regulatory Agency (MHRA) is warning people that manufacturer Abbott Medical Optics (AMO), is recalling two lots of AMO Complete multipurpose contact lens solution because of the potential to cause eye infections.
Alcon, which has been dedicated to the ophthalmic industry for over 50 years, develops, manufactures and markets pharmaceuticals, surgical equipment and devices, contact lens solutions and other vision care products that treat diseases, disorders and other conditions of the eye.
The preceding discussion of preliminary 2006 financial performance takes into consideration the recall of certain lots of multipurpose contact lens solutions that was announced separately today.
John Evans, the chairman and founder of Abatron, an independent contact lens solutions company based in Bedfordshire, has died after a long battle with cancer.
Alcon, which has been dedicated to the ophthalmic industry for more than 50 years, develops, manufactures and markets pharmaceuticals, surgical equipment and devices, contact lens solutions and other vision care products that treat diseases, disorders and other conditions of the eye.
In addition to its contact lens operations, Vistakon is also currently developing products to enable it to enter the markets for contact lens solutions and ophthalmic pharmaceuticals in the future.

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