Supposedly when Hitler, who was in a military hospital temporarily blinded after a gas attack, heard the news of the Armistice, he was so shocked the blindness relapsed. We basically have just Hitler's word for this, so who knows; but let's take it at face value, and extend it further to imagine that the shock left him not temporarily but permanently blind.
Two questions:
1. Can he still come to power?
2. If he does come to power, what's different about Nazi Germany under his rule (it's almost certain to be different in some way)?