Sunglasses can improve visual comfort and visual clarity by protecting the eye from glare.[8]
Various types of disposable sunglasses are dispensed to patients after receiving mydriatic eye drops during eye examinations.
The lenses of polarized sunglasses reduce glare reflected at some angles off shiny non-metallic surfaces such as water. They allow wearers to see into water when only surface glare would otherwise be seen, and eliminate glare from a road surface when driving into the sun.
The glare is neutralized by blocking the vertical (magnetic) components of light.