Legally blind is not necessarily totally blind. Anyone with vision worse than 20/200 that can't be improved with corrective lenses is considered legally blind. Anyone with a field of vision less than 20 degrees is also considered legally blind. There are lots of serious visual disorders that corrective lenses simply can't help.
I'm not going to say Mirai Nikki is a series grounded in hard realism - it's a "suspension of disbelief" kind of show. But let's give it a break when it comes to something perfectly realistic.
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