contact lens


Also found in: Dictionary, Thesaurus, Legal, Acronyms, Encyclopedia, Wikipedia.

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 ?
Rinse out the contact lens case each day and replace the solution.
cfm) that have been dipped in contact lens solution ( http://www.
The CDC also recommends that contact lens wearers replace their contact lens case frequently.
Moving forward, US practitioners will likely put more emphasis on patient adherence to particular recommended brands, and patients are likely to be less price-sensitive, favoring competitors over Bausch & Lombs older contact lens solution, ReNu MultiPlus.
An online survey was administered to a sample of contact lens wearers to determine how often contact lens wearers engaged in behaviors that could put them at risk for an eye infection.
A doctor not only selects the contact lens brand, but also sells the product.
Progressive, the high-performance contact lens for Astigmatism and Presbyopia, emphasizes how a presbyopic patient can see both near and far while wearing Duette Progressive lenses.
manufacturing facility in order to facilitate the further investigation of reports of fungal keratitis infections among contact lens wearers in the United States.
The American Eye-Q survey revealed 21 percent of contact lens wearers are guilty of this bad habit.
Following reports of an increase in the incidence of fungal keratitis, a rare eye infection, in the United States, that has also affected some contact lens wearers, Bausch & Lomb encourages contact lens wearers to protect the health of their eyes by following these guidelines from the American Optometric Association:
STUDY OBJECTIVES BCC Research's purpose in conducting this study is to provide an overview of the current and future characteristics of the global contact lens market.