Cyxus Not Just Eyewear Reading eyeglasses, stylish design for men and women, regain vision clarity, see what you like. Anti-Blu-ray lenses utilize special U.S. substrate processing technology to protect the eyes block harmful blue light UV400. Correct Reading Distance Your computer reading glasses magnification power depends on how far you are from the screen you are viewing. For a smartphone, tablet or a book about 12 to 18 inches away, select your normal reading power.