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 ?
There is a growing trend among Americans to alter the appearance or color of the eyes by using decorative contact lenses that often times are acquired illegally through vendors that don't meet quality standards which is a concern for optometrists.
Table 17: World 15-Year Perspective for Contact Lenses by
Avoid costume contact lenses unless they have been prescribed and fitted by a family eye doctor.
Complete worldwide contact lenses market report with more information is available at http://www.
In addition to keeping up-to-date with the main four or five large contact lens manufacturers, it is also about the smaller ones for me, such as Mark'ennovy, No 7 Contact Lenses and David Thomas, which produce specialist lenses.
Buying contact lenses without a prescription can pose serious risks to your sight or eye health, warns Dr.
3 Not swimming, using hot tubs or showering with contact lenses in.
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.
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.
But if you're looking for a cheaper shortcut to an eye change, such as borrowing a friend's, buying a used pair at a swap meet or ordering a pair of contact lenses off the Internet, ophthalmologists have one word of advice: don't.

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