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.
Farlex Partner Medical Dictionary © Farlex 2012

contact lens

n.
A thin plastic or glass lens that is fitted over the cornea of the eye to correct various vision defects.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

contact lens

Ophthalmology Crystalline ocular lens A transparent soft or rigid device placed directly on the cornea to correct refractory errors
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

con·tact lens

(kon'takt lenz)
A lens that fits over the cornea and sclera or cornea only; used to correct refractive errors.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

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
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References in periodicals archive ?
Multistate outbreak of Fusarium keratitis associated with use of a contact lens solution.
Since bacteria develops on the front and back of contact lenses due to regular use, contact lens solutions should be used to disinfect the lenses after using them.
DAILIES TOTAL1 contact lenses are specifically designed to address contact lens discomfort - they have the highest surface lubricity (or smoothness) and the highest breathability (or oxygen transmissibility) of any leading daily disposable contact lens,3 delivering exceptional comfort that lasts all day.
Statistics provided by the ministry show that in the first 11 months of 2017, Taiwan's contact lens manufacturers saw exports of US$331.7 million, an annual increase of nearly 25 percent.
The antibacterial properties of these contact lens solutions have been studied, but the duration of contact time between the contact lens and the solution has not been determined.
And among the reports that included the term "ulcer" or "keratitis," which is an inflammation of the cornea, more than a quarter included a modifiable factor associated with an increased risk for contact lens-related infections, such as sleeping in contact lenses or poor contact lens hygiene.
"As a market leader in the contact lens category, with over 60 percent of the market share, we are committed to provide best-in-class and innovative solutions to our customers at affordable prices.
On the other hand, Samsung publicly disclosed in a patent application that they would create a contact lens that enshrines a mini camera inside the lens, according to Sammobile.com.
The majority of wearers keep their contact lens cases for longer than recommended (82.3%); "topping off" solution in the case--adding new solution to the existing solution instead of emptying the case out fully before adding new solution (55.1%); or wearing their lenses while sleeping (50.2%).
All cases had a complete eye examination before the contact lens application.
The patent, dated June 2, 2015, coversa smart contact lens and a circuit containing light sensors (situated slightly over the iris) that scan the eye to form an "iris fingerprint" of anindividual.