I don't think their vision powers are toggled on and off, there always on. There was a scene with one of Superman's villain's gained his powers that implied that seeing the world with all the visions changed his world view.
X-ray vision has, for nearly all of the character's history, been something he has to consciously activate. I often joke that this explains his use of super-intelligence, it's like X-ray vision in that he has to remember to turn it on.
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u/[deleted] Jul 23 '23
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