Are Dogs All Nearsighted?

Dogs really are nearsighted — their vision is only about a fifth to a third of ours because their lens is twice as thick. They make up for it with a huge field of view (200–250°), sharp motion detection out to 1000 meters, excellent night vision from the tapetum lucidum, and a color world of mostly grays where red and green read as shades. Because their sight is limited, protecting their eyes day to day matters a lot.