A contact lens (or simply just "contact") is a lens, which is usually placed on the cornea of the eye and used for corrective or cosmetic purpose. The use of contacts is similar to the use of conventional glasses, but they are much lighter than glasses and it’s rather difficult to notice them in your eyes. You even can lose them, that’s why many firms, which produce contact lenses tint them in a faint blue to make them more visible when you clean or change them. Cosmetic lenses are colored to make your eyes more expressive. According to the research and estimation about 125 million people use contact lenses all over the world. There are different reasons why people choose contacts. Many of them think that they will be more attractive with contact lenses than with glasses. Wet weather affects contact lenses less; they do not steam up, besides they provide a wider field of vision. They are very convenient for those who like various sport activities. In addition, glasses cannot correct such ophthalmologic conditions as keratoconus and aniseikonia in a proper way.
 You must first of all visit an ophthalmologist, if you want to wear contact lenses. You should do it even if you just want contacts for changing your eye color and don't normally wear glasses. The reason is that contact lenses need to be prescribed, because they are medical devices, just like medicines. The eye doctor will check your eyes to make sure it's possible for you to wear contacts; today, almost everyone can, but there are some people, who can’t wear contacts at all. Then, the ophthalmologist will give you a recipe.
Many people who just begin to wear contacts are interested in the right way of putting the lenses in. The task is to put the lens on the top of your finger in such way that it forms a cup then hold it up directly in front of your eyes so you're looking at the side of the cup. If it's forming a "U" with the top edges flared out, it's inside out; if it's forming just a "U," it's correct.
Main rules for contact lens wearers:
1. Remember: every 12 month or frequently visit your ophthalmologist for examination;
2. Use only contacts, which are approved by FDA and prescribed by eye care professional;
3. Never share your contacts even with best friends;
4. Keep the lenses in your eyes no longer than it is prescribed;
5. Immediately consult your eye doctor if your eyes are red or irritated, don’t do anything by yourself;
6. Don’t wear contacts longer recommend wearing period. Throw away used lenses after that period;
7. Always wash your hands before handling contact lenses.
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