art source Sunglasses allow better vision in bright daylight, and may protect one's eyes against damage from high levels of ultraviolet light. Typical sunglasses are darkened for protection against bright light or glare; some specialized glasses are clear in dark or indoor conditions, but turn into sunglasses when in bright light. Most sunglasses do not have corrective power in the lenses; however, special prescription sunglasses can be ordered. Specialized glasses may be used for viewing specific visual information (such as stereoscopy) or 3D glasses for viewing three-dimensional movies. Sometimes glasses with no corrective power in the lenses are worn simply for aesthetic or fashion purposes. Even with glasses used for vision correction, a wide range of designs are available for fashion purposes, using plastic, wire, and other materials. Most parents experiences a lot of stress because of the changes in their children's life. In the area of raising their teenager they often times put themselves down. Constantly questioning their parenting skills. Once they realize their child is only experiencing a phase in their or her life, parents can continue living their very own lives. No matter how extreme your teenager is acting, you'll certain to have mixed feeling behind it. However, there's no reason to put your life on hold.