Board Thread:Naruto Discussions/@comment-4682609-20140507083715/@comment-1210805-20140507123655

Susanoo is a little different. It's not really produced by the eyes themselves, rather, its unlocked by mastering the powers of each eye. All other known Mangekyō techniques have actually centered around the eye. Amaterasu, Tsukuyomi and Kamui (the ranged version at least) actually require the user to make eye contact with the target.