A General Guide To Contact Lenses.
By: AdrianaNoton Date: Tue, 8 Dec 2009 Time: 10:59 PM
Contact lenses are those thin optical discs that are placed in front of the eye ball so as to correct eye defects or eye sight problems. They are the simplified version of ordinary spectacles and you might not even see them in someone's eyes if you've never heard of them. Generally contact lenses are a good development that has revolutionized the way people deal with eye problems.
There are two types of contact lenses, soft lenses and Rigid Gas Permeable (RGP) lenses. And as the names denote the soft lenses are soft and comfortable when worn, perhaps because of the fact that they are made up of over 80% moisture. Because of these subtle characteristics these soft contact lenses last for a fairly small period of time, perhaps close to a year if they are taken care of properly.
On the other hand the rigid gas permeable (RGP) are harder and contain very little water as compared to the soft lenses. The two advantages that these have is that they do not accumulate dirt and they seem to be more powerful by refining image more accurately than soft contacts
All lenses are specifically made to treat certain eye problems. This is to say that you can't just walk into a store and ask for a set of contacts because they will go on to ask you to set up an appointment with the optometrist. One particular type of contact lenses is the Toric lenses. Toric lenses are specifically made for people with astigmatism. Astigmatism is when a person sees blurry images of objects both far and close.
Another type of lens chosen with a particular predicament in mind are the Proclear lens. Proclear contacts help to treat and prevent dry eyes. Dry eyes is the unfortunate circumstance when the eye sockets contain very little water because the contacts in use have a very low water retention capacity of its own.
Proclear lenses are very much advanced when you think hard about it. Using superior biological mechanisms of the human body the inventors make use of human tissue with water retention abilities. In the laboratory this is combined with optical discs and the contacts take form almost magically.
Other types of lenses are the disposable contacts and the extended wear lenses. With the disposable lenses you are at liberty to throw them away after a few days of use. They are generally more comfortable; healthier and more user friendly as you can apply and remove them yourself. On the other hand the extended wear contacts can be worn continuously for 30 days and are harder.
Generally it is advisable to visit an eye specialist if you have problems with eye sight. This is because without a doctor's diagnosis you might wear the wrong contact lenses and worsen your eye problems.
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