Doctors will tell you that when they don t monitor the fitting, usage of the contacts, and the overall effects, they may cause you serious problems and possibly even blindness. While a lot of people use non prescription contacts, few of them experience serious problems. When an individual buys non prescription contacts without going to see an optician, they tend to forget the fact that contacts aren t for everyone. GP (Gas Permeable) contacts are made from a combination of fluorine and silicone, meaning that they won t attract protein near as much as other types of contacts. If you have had a problem with protein on your lenses in the past, GP contacts will pretty much eliminate that problem. Keep in mind, you ll still need to clean your GP lenses, in order to keep them free of protein, debris, and to keep them comfortable when you wear them. No matter how well you know the person, you should never switch contacts with them. Swapping contacts can damage your eyes, in the terms of protein and contact shape/power. Anytime your eyes start to bother you, you should take your contacts out and allow your eyes time to rest. Normally, if your contacts are causing irritation, allowing your eyes ample time to rest will correct the problem. The color of the contact shines through, making it appear that your eyes are indeed the exact same color as your contacts. Colored contacts work the same as other types of contacts. You simply use your prescription for contacts and select the color you want. If you are ordering them online, you ll find hundreds and hundreds of different colors and images. Wearing schedules Hard contact lenses can last for months, possibly even years before they need to be replaced. Soft contacts on the other hand, have a schedule for replacement. Some may need to be removed every 2 weeks, monthly, or even daily. The more advanced contact lenses, such as Night and Day contacts, will allow you to wear them all day and all night. 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.