A polarized lens is a sunglass lens that reduces glare. It has a special filter that blocks highly reflected light. A polarized lens is a great overall sunglass and especially great for outdoor sports, water sports , snow and for all who are light sensitive. It blocks UV rays and provides excellent sun protection for the eye. Occasionally, a polarized lens is not desired, such as with downhill skiing, where it is important to see shadows in the snow and for someone who needs to view LCD displays which can look distorted with a polarized lens.