All the life we have listened that sunglasses are used to protect our eyes from the sunlight by blocking the light from the sun. It is also used to preserve our vision. But a few people around the world actually know how sun glasses do that. There are different ways in which sun glasses work. Ultraviolet rays are present in the sunlight can be very harmful for the corneas present in eyes and can damage it. Moreover sunlight can force you to close your eyes sunglasses help you in opening your eyes even in sunlight. One of its great importance is it protects you from glare, when sunlight reflects from a shiny surface the light amplifies it is called glare and could be blinding that could lead to fatal accidents, so sun glasses protects you from that too.