Eyewear Our range of eyewear is light and easy to wear, and some can even be worn over your existing prescription glasses. Read the five-step guide to getting the right sunglasses from our Sight Loss Advice Service. 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. It is not possible to predict which colour filter will be best for your eye condition, you should try different colours in the environment where you get the glare symptoms to find the best one for you. If you need more help, please contact your optician or low vision specialist. The percentage listed for each filter is the amount of light that is transmitted through while the rest is blocked.