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It's difficult to keep your eyes closed all the time. Try it sometime and see, especially when you are walking around, talking, working etc.
Blind peeps can't tell if they are facing the sun (unless it's fairly hot, direct light) so the glasses are there to protect the retinal nerve, and to protect from the pain that can come from burning different parts of your eyes.
They also can't see dust or other particles so they don't have the involuntary reaction that closes our eyes when something gets near. It's also for physical protection.
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