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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. Car performance is more than simply the ability of a motor vehicle to succeed in top speeds to make sharp turns; in addition, it is due to the suitable performance of its components. It is the hundreds of car parts, from the smallest screws and spark plugs on the big tires, working together in harmony that defines car performance. It is these parts that enable motorists to experience the exhilaration of driving or riding in a well-maintained vehicle.