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I wasn´t aware of that fact for a long time, but certain diseases that affect vision, only leave a tiny spot in which they can see. As if you were cutting a really tiny, tiny hole into a cardboard. So they can focus on things right in front of them, like books, or memes, but the rest of their vision is black, that´s why they need the stick to guide them, because they can´t see a lot of their surrounding