Board Thread:General Discussion/@comment-2.122.72.30-20160716110713/@comment-27247962-20160718112820

^You are on to something.

There are basically 3 options i can think of when it's literally one eye. Either an OEG like Kaneki or Eto, a person that can only use one eye anymore (his other wounded, gone, slashed, whatever) or any ghoul with a kakuja that transformed in a way that only one eye is visible.