With that in mind, park says that there are three reasons we must protect the eyes: This one happens with age, regardless, but can be slowed with. While most people reach for their dark lenses because of the bright glare of our closest star, other people wear their shades for more reasons than simply sun protection. Why blind persons wear dark glasses. Their eyes may be sensitive to light. A blind person highly sensitive to bright lights (photophobic) may feel pain in their eyes and temple. Obviously they wear them when it is sunny outside so as to protect their current vision as well as to allow their night vision to be unaffected. Wearing very dark glasses allows. Protects from a cell phone or digital screen glare at night. As the name suggests, these decorative eyepieces are meant for daytime use.