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 ?
1] The contact lens solutions tested in this experiment are listed in (Table 1).
National outbreak of Acanthamoeba keratitis associated with use of a contact lens solution, United States.
Food and Drug Administration, recalled its Complete MoisturePLUS multipurpose contact lens solution.
Contact lens wearers also should practice good hygiene, including hand washing and drying before handling lenses, avoiding reuse of contact lens solutions, and following the specific instructions of manufacturers of contact lenses and contact lens solutions.
In 2007, an outbreak of AK occurred (30) which was linked to a contact lens solution, Complete MoisturePlus (AMO, Santa Ana, CA) that was subsequently withdrawn from sale.
for use of the Aganocide compounds in the eye, ear and sinus, and in contact lens solutions.
Researchers believe the results suggest that this type of bacteria should be included when testing the efficacy of contact lens solutions to ensure that procedures are robust enough to kill all strains of Pseudomonas aeruginosa.
Last year the company premiered an integrated marketing campaign that broke through the commoditized market of contact lens solutions to drive sales of its Biotrue multipurpose contact lens solution.
The bulk of vision care sales in the mass market still is generated by contact lens solutions and related accessories.
The American Academy of Ophthalmology (Academy), the Contact Lens Association of Ophthalmologists (CLAO), the Cornea Society and the American Society of Cataract and Refractive Surgery (ASCRS) urged the changes as experts report that the number of cases of microbial keratitis, particularly Acanthamoeba keratitis, among contact lens wearers remain steady, despite attempts to improve contact lens disinfection regimens over the years and voluntary recalls of contact lens solutions associated with keratitis outbreaks in 2006 and 2007.
POLAROID CONTACT Lens Solutions has developed new merchandising material to launch its 'on the go' range of eye care products.

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