Mirrored sunglasses are sunglasses with a reflective optical coating(look like mirror from outside). The mirror coating lenses can decrease the amount of light passing through the tinted lenses. They are suitable for wearing in environment of sand, water, snow and higher altitudes. So, mirrored sunglasses are not just used for fashion, they can also available for mirrored sunglasses.
Mirrored sunglasses have a reflective optical coating which is also called a mirror coating or flash coating on the outside of the lenses, thus this kind of sunglasses look just like small mirrors. Mirrored sunglasses can be used in conditions of sand, water and snow. They are specially useful in high-altitude situations because the mirror coating can help decrease the amount of light passing through the lenses and allow less light to reach the eyes. Mirrored sunglasses are often used in ski goggles and sunglasses.