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

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 ?
The changing trends in consumer behavior have accelerated the sales of contact lenses. The rising burden of diabetes and technological innovations have paved the way for smart contact lenses into the market.
Dr Pramod Warhekar, Consultant Ophthalmologist at Mediclinic City Hospital, adds, "Infection of the cornea is the most important risk factor for patients who sleep with the contact lenses. In addition, it can cause more dryness of eyes and allergic conjunctivitis due to the deposition of proteins on the contact lens."
One of OTs biggest records was related to the story of a women who did not know that she had 27 contact lenses in one eye until the incredulous surgeon started to remove them.
"Research into the benefits of contact lens wear for children and teens found that contact lenses significantly improved their quality of life, so it's always worth a parent having a chat with their optician if their child is interested.
For 11- to 16-year-olds, they are more interested in contact lenses for activities and sports, while 17- to 22-year-olds are more interested in contact lenses for appearance-related reasons (socializing, beauty, sunglasses)," she adds.
Further, the plastics used in contact lenses are different from other plastic waste.
In conjunction, the Bausch + Lomb ULTRA contact lenses are engineered to provide all-day comfort and consistently clear vision.
-Never wear your contact lenses in the presence of harmful or irritating vapors or fumes.
Risks Of Wearing Halloween or Other Decorative Contact Lenses
Legally, contact lenses should only be sold under the supervision of a registered optician or doctor who can check they will not cause damage.
This makes the case for ophthalmologists' reminders to never sleep with your contact lenses.

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