Well technically going on the subject of astral projection. Technically they can, when they are removed from their physical body, they can see, because they no longer are blind in the different consious level. Its similar to that actually sometimes Deaf people can have hearing dreams. And hearing people can have dreams with no sound. it all depends. Its a very complex theory/data. I'll try and get some more info for you.
-Al the Vykker
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