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 ?
Lyell et al., "A comparison of the ability of three common contact lens solutions with different constituents to inhibit the growth of Staphylococcus aureus," African Vision and Eye Health, vol.
Contact lens solutions were tested by non-probability sampling method.
National outbreak of Acanthamoeba keratitis associated with use of a contact lens solution, United States.
They inquire whether the geographic pattern of AK outbreak-associated cases coincides with distribution of [greater than or equal to]1 manufacturing plants for the associated product, Complete MoisturePlus (CMP) multipurpose contact lens solution (Advanced Medical Optics [AMO], Santa Ana, CA, USA).
Food and Drug Administration, recalled its Complete MoisturePLUS multipurpose contact lens solution. The first time was because of possible bacterial contamination and the second was because of concerns the solution might be linked to a rare but serious eye ailment among soft lens wearers.
There is a staggering array of contact lens solutions available, the suitability of each depending not only on the type of contact lens, but the type of patient and how they wear their lenses and you should be guided by the ECP on this before recommending solutions to patients.
Testing of new products is affected, as FDA regulations require that a manufacturer with a new contact lens solution demonstrate that it is just as safe and effective as an already marketed product.
Although certain patients have reported use of other contact lens solutions, the analysis does not indicate that these products are associated with significantly increased risk for disease.
This $1-billion plus category includes contact lens solutions as well as eye drops, which accounts for about one-third of the sales.
* Contact lens solutions to binocular vision problems

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