Sunglasses are popular as a fashion accessory but are most importantly a form of protective eyewear designed to prevent bright sunlight from damaging the eyes. Sunglasses should be worn whenever you’re outdoors, year round. You are even exposing your eyes to damaging UV rays on overcast, hazy days. Choose sunglasses that provide full protection against ultraviolet light. UV eye damage is cumulative over a lifetime so it is important to make wearing sunglasses a habit early in life.