Eyeshields are designed to exclude harmful ultraviolet (UV) and blue light, which can damage the retina. The different filter tints can help increase contrast and definition. Your eye specialist can advise you which filter colour would best suit your eye condition. They're light and easy to wear, indoors and out, and some can even be worn over your existing prescription glasses. The menu below explains which condition each colour filter is suitable for. The percentage listed for each filter is the amount of light that is transmitted through while the rest is blocked.