Board Thread:Theories and Speculation/@comment-27916438-20170329044844/@comment-25122992-20170410163248

Doesn't necessary have to be so. If it's Hashi's DNA that prevented Obito from going blind, then it's seemingly because of the enhanced regeneration that healed the eye and didn't allow the sight to deteriorate, which isn't a natural ability, but something unique to Hashi only, i.e. the blindness was avoided only through artificial and external means.