Actually that would depend on how bad his eyesight was. I never go anywhere without my glasses. I don't even leave the bathroom after a shower without them.
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Right, thats my point . Leaving (or being taken) without his insulin pump is VERY serious, even more so than leaving without his glasses even with very poor vision. So to me both of these things indicate that if he left himself he was very freaked/irrational, OR that he was forced/taken.