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 ?
Never use eye drops or solutions not intended for use with contact lenses.
Wearing unprescribed decorative contact lenses can lead to an infection, blindness, decreased vision, itchy or watery red eyes or a cut or scratch on the top layer of the eyeball.
Wearing contact lenses can increase your chances of getting a severe eye infection caused by germs commonly found in water.
Besides spectacles being quite impractical for me as an athlete, I find contact lenses so much more comfortable.
He said dry weather condition coupled with high pollution levels had also made application of contact lenses quite hazardous.
People with complaint of arthritis, joint problems, glaucoma, allergy and dryness in eye must not use contact lenses under any condition," he said.
The study highlights an interesting change in consumer perception of contact lenses being a vision correction solution to more of a lifestyle decision.
Discover the latest market trends and uncover sources of future market growth for the Contact Lenses industry in India with research from Euromonitor's team of in-country analysts.
The law states that the contact lenses must be dispensed in the presence of an optician or medical practitioner.
Google also aims to design smart biometric technology to aid the health of humanity with its smart contact lenses, which can detect blood sugar levels via tear ducts.
ClickPress, Fri Apr 10 2015] Contact lenses continued to have the highest growth in eyewear in Russia with 16% value share and 7% volume share.
Another lawsuit has been filed against the major manufacturers of contact lenses claiming the companies violated antitrust laws as they conspired to artificially fix prices.

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