contact lens

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con·tact lens

a lens that fits over the cornea and sclera or cornea only; used to correct refractive errors.

contact lens

n.
A thin plastic or glass lens that is fitted over the cornea of the eye to correct various vision defects.

contact lens

a small, curved lens, primarily plastic in composition, shaped to fit the person's eye either to correct refractive error or to enhance appearance. The two primary forms of contact lenses are (1) rigid gas-permeable lenses, which are small, are durable, and have little to no water absorption; and (2) soft lenses, which are larger, are more fragile, and have a 30% to 70% water content. Contact lenses float on the precorneal tear film and must be inserted, removed, cleaned, and stored to prevent damage or infection to the eyes. Patients should not sleep with their lenses in their eyes.

contact lens

Ophthalmology Crystalline ocular lens A transparent soft or rigid device placed directly on the cornea to correct refractory errors

con·tact lens

(kon'takt lenz)
A lens that fits over the cornea and sclera or cornea only; used to correct refractive errors.

contact lens

An optical correction worn in contact with the cornea and taking the place of spectacles. Most contact lens wearers are shortsighted (myopic) and enjoy a generally better standard of vision than with glasses. Hard contact lenses are made of acrylic PMMA (poly-methyl-methacrylate or ‘Perspex’) or CAB (cellulose acetate-butyrate) or co-polymers of various plastics. Soft lenses are mostly made of HEMA (hydroxy-ethyl-methacrylate). Hard lenses are always of smaller diameter than the cornea, soft lenses are usually of greater diameter.

Patient discussion about contact lens

Q. Contact lenses I’m 17 years old girl, and I have glasses since third grade. I never had any real problems with wearing them,. my best friend always encourage me to try contact lenses, but it seems so strange to put something on directly on your eyes- is it safe? How difficult is it to do?

A. Consult your ophthalmologist (eye doctor) before you decide.

Q. My contact lenses get very dry and it hurts. any suggestions?

A. Dry contact may signal they should be replaced with new ones, and pain may result from damage to the lenses (e.g. torn lens- VERY VERY hurts). However, as much as I would like to help you, it's just impossible to give you the correct diagnosis over the net without even looking at your eyes. So if you feel any problems with your eyes, ophthalmologist (eye doctor would be the answer).

Meanwhile, you may read more here:http://www.nlm.nih.gov/medlineplus/eyewear.html

More discussions about contact lens
References in periodicals archive ?
Last February, soccer fan Stephanie Berndt donned decorative contact lenses to support her favorite team.
These include bifocal (for close and distance seeing) or multifocal (for close, intermediate and distance viewing) contact lenses.
Biosignal's key product development is a permanent anti-bacterial coating for contact lenses.
What do I need to consider when buying contact lenses on the Internet, by phone or by mail?
Modern contact lenses appeared on the market in 1949, says Keith Parker, general manager of Essilor Laboratories' contact lens division in Denver.
The use of contact lenses is becoming less and less controlled, and the problem is more acute around Halloween with the costume lenses,'' says Dr.
Both the costs and risks of LASIK are probably less than a lifetime of wearing contact lenses, especially extended-wear contacts that are worn during sleep.
The Excimer laser can sculpt or reprofile the cornea to reduce or eliminate the need for glasses or contact lenses and is more effective for higher degrees of nearsightedness; LASIK (Laser Assisted Insitu Keratomilosis), an Excimer form of surgery, can correct an even higher degree of myopia.
Contact lenses are not new - they were first invented over a century ago - but it's only recently that some of the difficulty of using direct contact lenses has been eased.
Scleral lenses are large-diameter gas permeable (GP) contact lenses.
The problem is that contact lenses not approved by the FDA may be made with materials that can harm the eyes by causing corneal ulcers or keratitis.
Most patients might only want to use contact lenses on holiday, for social occasions or sport, but we now have some fantastic daily disposables for part-time wear.

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