Visible light is light that can be perceived by the human eye. These security films, if applied properly, can also provide protection for vehicles. This initial pickup is called the "first call", hence the name of these vehicles. When you look at the visible light of the sun, it appears to be colorless, which we call white. The combination of every color in the visible spectrum produces a light that is colorless, or white (see How Light Works for details). See Patent 5,268,217 for details. What we see when we try to look at these brighter areas are flashes of white -- this is glare. The wavelengths of the light we can see range from 400 to 700 billionths of a meter (nanometers). Because of car tinting , UV light can damage both your cornea and your retina. Prolonged exposure to light of such intensity can cause damage resulting in temporary or even permanent blindness. The small amount of UV-A that gets past your cornea and reaches the retina can eventually lead to macular degeneration, the leading cause of blindness in people older than age 65. Intense and prolonged exposure to UV radiation can cause either cancer of the eye or photokeratitis, which is basically a sunburn on your retina. There's a simple test you can perform before you buy them to make sure. While the tint color and a similar frame design may make them look like Oakley X-Metal Romeos or Ray-Ban Predators, the actual lenses are very different. MX-5 roadster while having a similar shape to the MX-3. If you go outside on a sunny day, the brightness ranges from about 1,000 lumens in the shade to more than 6,000 lumens on a large stretch of concrete, like a highway. The brightness or intensity of light is measured in lumens. For example, when you are indoors, most artificial light is around 400 to 600 lumens.