Interestingly he didn't have them prior to his Noah awakening which means he gained those while losing his sanity under the influence of the Noah memory. This serves to enhance that fact that he is Ax-Crazy. General Winters Socalo has completely white eyes.Specific subtropes include Black Eyes of Evil (pure black eyes indicating that serious evil is present) and Red Eyes, Take Warning (pure red eyes means something really bad is going to happen).
Blank eyes coupled with Glowing Eyes of Doom usually indicate that someone is using his/her power (e.g. This does, however, have the drawback of dehumanizing them in the eyes of some fans.
Apparently, this is to make them look more 'disguised' than they would with just their (normally pretty flimsy) half-masks. Many modern comic books have superheroes' eyes turn pure white while wearing masks. In speculative fiction, Prophet Eyes are used to indicate prescience or clairvoyance. In some anime and manga, Blank White Eyes are used to indicate shock. One common application is Mind-Control Eyes. This trope is used to highlight the unnatural and the alien in a work. In fiction, however, this isn't an issue, and you can get characters with eyes that have only one color. In Real Life, some people have different colored irises, but what they can't have is a pupil, iris and sclera be the same color. Usagi Yojimbo, 'The Nature of the Viper'
