The lenses of prescription sunglasses have a built-incorrection prescription. This ensures they protect your eyes from the suns damaging UV rays, minimise sunlight, and help you see better. They are also practical. If you have shades, these special sunglasses will be a perfect option if you're going to be outside where it's not practical to wear them. This also removes the need to wear two pairs of lenses, one for eyeglasses and the other for sunglasses. Heavyglare provides the best collections of prescription sunglasses around the US at a great deal.