When you attain level 3 on mushrooms, when you close your eyes you see three dimensional objects. Which shows that you do not see with your eyes, you see with your brain. If someone had sight at one time, they have images stored in their brain, so they would probably see something, but if they've never seen anything, I don't know. Is it possible the energy you get from mushrooms would affect them in a different way? Maybe they would smell things? More audio hallucinations? Have a strong feeling over their skin? Extraordinary tasting abilities? Good question duppy, never thought about it before.