Detailed answer

When our eyes are exposed to the sun's harmful ultraviolet (UV) rays, the delicate skin around the eyes can become damaged. This can lead to excessive production of melanin, which causes dark circles to appear. Additionally, UV rays can break down collagen and elastin, which are essential for maintaining skin elasticity. When these proteins are damaged, it can result in sagging under-eye skin and the formation of bags. By wearing sunglasses with proper UV protection, you can shield your eyes and the surrounding skin from the harmful effects of UV radiation, thus reducing the risk of dark circles and under-eye bags. It is crucial to choose sunglasses that offer 100% UV protection and have large lenses that cover the entire eye area effectively.