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 ?
Orthokeratology lenses are specially designed to reshape the cornea during sleep, providing lens-free daytime wear while Toric contact lenses are used to correct astigmatism, as well as for myopia and hyperopia.
ACUVUE OASYS Brand Contact Lenses for ASTIGMATISM with HYDRACLEAR PLUS Manufactured by: Johnson & Johnson Vision Care Inc, pack of six lenses; lot no BC 6.
Risks Of Wearing Halloween or Other Decorative Contact Lenses
Contact lenses are a safe and effective way to correct your vision when they are worn and cared for as recommended, said Jennifer Cope, M.
Because she had harbored these contact lenses in her eye for an unknown length of time, if we had operated, she would have had a lot of bacteria around her conjunctiva,' explained Morjaria.
We designed Onefit Scleral Lenses to have an array of benefits, many of which make them the ideal choice for athletes and active individuals such as Gabby Chaves" said Jean Blanchard, President of Blanchard Contact Lenses.
He said the use of contact lenses was not advisable for every one and people prior to use eye lenses must get their eyes duly examined by a qualified eye specialist.
Responding to a question, he said use of contact lenses is not advisable for every one and people, prior to the use of eye lenses, must necessarily get their eyes duly examined by a qualified eye specialist.
The study further reveals that most males between the age 21-30 years feel they needed contact lenses at their workplace to be perceived as well-groomed.
Contact lenses is expected to continue to register strong growth over the forecast period, driven by younger consumers.
ages 18 and older who wear contact lenses reported at least one risky health behavior.

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