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.
Never re-use contact lens solution, always use fresh for cleaning and storage
Rub and rinse the case with contact lens solution, dry with a clean tissue and store it upside down with the caps off after each use;
Reports of an unusual incidence of Fusarium keratitis among contact lens wearers first came from health authorities in Singapore, Hong Kong and Malaysia.
An increased danger exists in that eye care specialists, who may routinely see contact lens wearers develop bacterial infections, may not be aware of this marked increase in fungal infection and may not take cultures.
In addition, therapeutic, aesthetic and cosmetic are the major reasons driving the growth of contact lens market globally.
OPTI-FREE(R) RepleniSH(TM) MPDS is a significant advancement in the field of contact lens solutions," said Dr.
SCOPE OF THE STUDY The scope of this study covers contact lens in medicinal devices markets.
Yet many new contact lenses and other products have been developed to increase contact lens comfort.
and chair of the AOA's Contact Lens and Cornea Section.
Global Contact Lens Market 2015-2019 research report segments the industry into soft lens, RPG lens and hybrid lens while considering revenue generated through the sales of contact lenses to calculate the global market size.
What are the aspects of your contact lens assessment which make it particularly 'gold standard'?