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When people want to know all about contact lenses, they will do quite a bit of research on the subject, and then they feel they are better prepared to discuss it with their eye professional. To know all about contact lenses, people must consider create a self-guide that will lead them through many areas of contact lens purchase and wear.

An eye care professional will be the only person that can tell you outright whether or not you can wear contact lenses. The eye testing for contact lenses is a bit more detailed than those tests that are done for framed lenses. Contact lens tests involve measurements of the entire eye area including the slope of your eyelid, position of eyelashes, and the moisture levels in each eye.

On top of the usual visual acuity measurements, eye professionals will determine where you have an astigmatism problem that would interfere with normal contact lens prescriptions. If there is an astigmatism problem, then some people may have only gas permeable lenses offered. If this is the case, some people find this very unacceptable and decide against wearing contact lenses entirely.

You know that you have some sort of vision problem when things start to get blurred and your eyes tire easily. These contact lenses have to be fitted properly because everybody's eyes are different dimensions. If they have astigmatism, the surface of the cornea is shaped differently. This factor will keep most soft contact lenses from floating properly over the surface of the eye.

People must know what contact lenses are made of, in order for them to care for them properly. Some people have made the mistake of soaking their soft contacts in salt water, and are left with a rubbery stub of what used to be their contact lenses. Contact lenses are made up of almost 79 percent waters, and salt will dry them out terribly.

Soft contact lenses are very easy to wear, and people become accustomed to them faster than they do if they had to wear gas permeable lenses. Gas permeable lenses will resist buildup better, but they are more rigid and durable than soft contact lenses. For people that work in industrial environments, the gas permeable lenses are a better choice. They can keep a pair of soft contact lenses at home for casual wear around town.

Many people choose contact lenses that do not have to remove from eye every 30 days. These are continuous wear contact lenses, and while you can sleep in them and do most every other activity in them without having to remove them from the eyes, these contact lenses are designed for this purpose with materials that allow oxygen to reach your eyes. All soft contact lenses can not be worn for 30 days and some people try to do it anyway and end up damaging their vision and their eyeballs.

As long as you have a contact lens prescription in hand, you can purchase contact lenses from any source that will give you a good price. By law, contact lens replacement services have to have the actual prescription on file before they can begin to make you an extra pair or two of contact lenses.