Can I alternate between contacts and glasses?
If your lenses are soft, probably yes. People who find lenses difficult to tolerate often use them only for social or sporting occasions.
Can I wear contact lenses occasionally, just for parties, for example?
Most likely yes with soft lenses, but rarely can this be done with hard lenses since they need more adaptation.
Can I alternate from soft to hard lens wear?
Yes. If one sort is becoming uncomfortable your practitioner may suggest you try another for a short time.
Do contact lenses cause allergy?
Lenses themselves will not although their protein coating may. Cleaning solutions that get rid of protein deposits are widely available.
Can contact lenses cure color blindness?
Ordinary contacts do not help but if one lens is red and the other clear it can help reduce the problem of red-green color blindness.
Are bifocal and trifocal contact lenses available?
Yes, but they are not always effective. Under 50 percent of wearers find them useful.
Does everyone succeed with contact lenses?
No, only about 70 percent over a two year period of follow up. We are confident the rate will improve as advances are made, but it will never be 100 percent.
Do contact lenses fall out?
If they are fitted too loosely or if you rub your eye this can happen. Soft water absorbent lenses many fall out if a sharp jet of air is directed on to the eye, such as an air vent in an aircraft or car. Hard lenses are more likely to be lost than soft lenses.
If I cry, will the lenses come out of my eye?
Hard lenses may become dislodged but not soft lenses.
Can I use medically prescribed eyedrops or other eye preparations while wearing contact lenses, other than those specifically for them?
This is not advised but your practitioner will be able to give a final yes or no, depending on the medication and type of lens being worn.
Can children with sight defects wear contact lenses?
Yes, they tolerate lenses very well. See this page for more details: Can Children And The Elderly Wear Contact Lenses?
If an object strikes the eye will the contact lens make the injury worse?
No. In fact the lens protects the eye from extensive damage.
What material is a contact lens made of?
The original hard lens material was PMMA (polymethyl methacrylate) but most hard materials are now mixtures of acrylate and silicone rubber so as to allow gases (oxygen) to flow through the material. Soft lenses containing water mostly stem from PHEMA (polyhydroxyethy methacrylate).
How long does a contact lens last?
It depends upon how it is used and the material. In general, constantly worn soft lenses last six months to one year, daily worn soft lenses one to two years, and hard lenses two to ten years.
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Frequently Asked Questions (FAQ'S) About Contact Lenses: