Light from the sun contains a spectrum of wavelengths. We can only see light over a small range known as the visible spectrum but cannot see the infra-red and ultraviolet (UV) light outside the visible spectrum. There is good evidence that excessive exposure to UV light can damage the eyes in particular, a small part of the retina called the Macula. Too much UV can also make the lens in the eye go hazy – a condition known as cataract. A special coating can be applied to spectacle lenses which helps to block the UV light providing extra protection for your eyes.