Why Younglings Really Wear Those Helmets

Why do Younglings wear those big helmets during lightsaber training? Why not just a blind fold?
in Attack of the Clones we saw them training with Master Yoda as Obi-Wan Kenobi came in, asking about Kamino, but he couldn't find it. Until jedi youngling Liam mentioned it could have been erased from memory.
This leads Yoda and Obi-Wan to realize only a Jedi could have done this!
But who?!?!

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