Once you clean them they should last you for a long time before they need to be cleaned again. One of the best attributes to extended wear contact lenses is the fact that they are very comfortable. They are easy to put in your eyes, and most people don t even notice that they are wearing any contact lenses at all. Each and every colored contact has the color or design coded on the contact itself. When you wear a pair of these lenses, it is actually the color that has been coded into the contact that projects the colored image everyone sees when they look in your eyes. The color of the contact shines through, making it appear that your eyes are indeed the exact same color as your contacts. These two adjustments in the contact lens are very distinct, with a sharp line between them. Even though they may sound hard to use, most people find that they are easy use with a little bit of practice. One type of bifocal lens is the aspheric lens, which have a more gradual change of focus. Both power are in the central area of the pupil, and similar to the concentric lens, your eye will immediately adjust to these lenses and decide on the focus that is best to use. Optical are the most common, as they are for the correction of vision and anomalies you have may have. Therapeutic lenses are normally soft contacts that serve to protect your cornea. They are also used as a reservoir for certain medicines that are used to treat various cornea diseases and malfunctions. If you have the money to spare, you would be better off getting a pair of brand name contacts. On the other hand, if you are on a limited budget, cheap contact lenses would do you good - at least until you get the money to buy one of the better brands. Cheap contacts can be found on the Internet, or at your local optician s office. If you don t get fitted for your contacts, you could very well get a pair of contacts that could damage your eyes. There are several types of contact lenses available in two main types - hard contact lenses and soft contact lenses. The hard contact lenses include gas permeable and the conventional hard lenses.