Caddis Sun Readers are sunglasses with bifocal reading segments on the back of the lenses. Bifocal lenses allow the wearer to look through two areas of the lens. The upper portion of the lens has no magnification, which allows you to focus on distant objects. The bifocal segment is for reading at close distance. The sun shade tint protects your eyes from harmful UV light and makes it easier to see in bright conditions.