Once you have worn a pair of contacts for a period of time, the protein in your eyes builds up on the lens, which you eventually have to change out. Protein is a bad thing, which is the reason why you must clean your contacts frequently and soak them in solution for hours at a time. After you have worn them during the day, simply throw them away at night - and wake up in the morning to a brand new pair. In order for your optician to give you a prescription for contact lenses, your cornea will need to be free of any type of problems that can prevent you from wearing them. Normally, your optician will give you a trial pair of contact lenses to try out, and then check them for fit once they have settled in your eyes. Once your hands are clean, sit the contact lens on your index finger. Next, place a drop of solution in the center of the lens. Now, use your other hand and pull down your lower eye lid with your thumb then look up with the eye you will be inserting the contact lens into. Take your index finger with the contact on it and place it into your eye. Most types of contacts need to be replaced every 2 weeks, and replaced with a fresh pair. If you are using daily disposable lenses, you should always throw them away before you go to sleep, then wake up to a fresh new pair in the morning. Another common mistake people make, that can easily damage or affect contacts, is swapping them with other people. You can also find extended wear contact lenses locally, although the Internet is the best way to save money. Before you decide to buy a pair of extended wear contact lenses, you should make sure that they are right for you. When you get fitted for your contacts by your eye doctor, be sure to ask him about these types of contacts and whether or not they are best for you. All About Contact Lenses As most of us know, contact lenses are the best alternative to glasses. They are small, plastic shaped discs that are made to correct eyesight problems like nearsightedness, astigmatism, farsightedness, and other problems. Contact lenses are also used by those who have had cataract surgery, as they can help the eyes to heal a bit faster.