Board Thread:Lore Discussion/@comment-2165692-20140425203121/@comment-24902649-20141205172734

Plus, even if they did have functioning eyes (I'm not saying they do), they'd still have bad enough eyesight that the use of bows would be impossible without some other kind of sense. If they had ears sensitive enough for passive echolocation, they could ostensibly "see" a two-dimensional version of the world around them based on vibration harmonics.

Although if their ears were that sensitive, you'd think a Shout would send them all writhing in pain. But gameplay had to happen, so it doesn't.