On the way to Karakura town, Ichigo is informed by Unohana that he is the only one with a chance of defeating Aizen, as he alone hasn't seen his Shikai.
Ichigo..apparently does nothing about this. He doesn't blindfold himself or protect his eyes in any way that would be obvious to an anime viewer. Aizen could presumably just activate his weapon and negate Ichigo's only advantage at a whim.
Does Ichigo do anything to protect him from Aizen's illusions? If not, why does Ichigo charge Aizen without any regard for protecting himself from his game-ending ability, despite being warned about it minutes earlier?