Why we need sunglasses and how does sunlight damage the eye?

Sunglasses is a protective eyewear that is widely used by most people to prevent strong light from entering the eyes. They can also be a form of visual aid which incorporates coloured or polarized lenses. Despite its protective function, sunglasses is known as s a fashionable item and they do add a sense of styleto [...] http://bit.ly/a3HPiz