Contacts will need some time to adjust to your eyes, and your eyes will need some time to rest. If you wear them too long when you start wearing them, they can harm your eyes. Your optician will tell you what he recommends, which is normally a few hours during the day then take them out. With each passing day, you can wear them for longer periods until your eyes gradually adjust. Some people are more prone to dryness in their eyes than others, meaning that the contacts you are prescribed shouldn t aggravate the dryness. 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. You may also need to use eye drops as well throughout the day when wearing contacts, especially if your eyes start to dry out. Glasses and contact lenses can both correct astigmatism as well. If you have astigmatism, you can wear either glasses or contacts. Astigmatism is an odd cornea shape that impairs vision, common with older people. If you are going to use the same color or the same pair of contacts for a while, you may want to go with daily wear lenses. Daily wear contact lenses will last you a lot longer than the disposable lenses, although they will need to be disinfected and cleaned on a regular basis. As long as you clean and disinfect them on a regular basis, they will last you for quite a while. Contacts are divided into two main groups - soft and rigid (hard). Soft lenses are gas permeable to a certain extent, being further categorized by the amount of water they contain. Soft contacts can have either a low, which is less than 50 percent moisture, or a high moisture content, which is more than 50 percent. Once you have inspected that side, simply put the in the palm of your hand and give them a thorough inspection. You should always do this one contact lens at a time, before you plan on wearing them. If you wear contacts, you should always make inspecting them a part of your daily routine. Along with inspecting your contact lenses you ll need to keep them clean.