Contact lens wearers often adore their vision without glasses. The ability to see without the encumbrance of glasses is invaluable. However, one of the risks of wearing contact lenses is the higher chance of contracting an eye infection. The root cause of many of these infections is carelessness on the part of the lens wearer. Those who wear contact lenses often engage in lackadaisical and risky behavior. One hazardous action is to sleep in your contact lenses. Doctors warn against sleeping in them because it is the leading cause of corneal ulcers which can lead to a corneal transplant or the loss of the whole eye. Another risky habit is to wear contact lenses when cooking or barbecuing or near another source of heat. The danger lies in the fact that contact lenses are made out plastic and can melt when the wearer is near a heat source resulting in permanent blindness.