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 ?
Rae Skinner, 56, switched to bifocal contact lenses as her presbyopia hit.
In May, Biosignal and the Institute for Eye Research, announced successful proof-of-concept based on anti-bacterial protection of contact lenses in animal studies.
You should always have a current, correct prescription when you order contact lenses.
Typical soft contact lenses have a transmissibility of 20 barrers.
If you're using a friend's contact lenses, you expose your eye to any of a previous wearer's infections.
Glasses, contact lenses or refractive surgery such as LASIK can correct refractive conditions.
Today's contact lenses are computer-designed for comfort and to offer the vital oxygen-ation that your eye needs.
Designed to provide the crisp optics of a GP lens combined with wearing comfort that rivals soft lenses, hybrid contact lenses also are available for more common conditions, such as astigmatism and nearsightedness.
You can't be sure what you're getting when you buy over-the-counter contact lenses, which can be very dangerous to your eyes," said ophthalmologist Thomas Steinemann, M.
Some years ago the Association of Contact Lens Manufacturers carried out research which showed that if a patient buys their spectacles, contact lenses and solutions from one practice, they are not only more profitable for the business but they also become a more frequent visitor to that practice, building more loyalty to the practice's brand.
which challenged some of the myths associated with contact lenses and highlighted the key role contact lenses play in restoring eye vision by correcting refractive errors.
34) And, if you wear contacts, ask your eye care specialist about contact lenses with UV protection.

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