One night I swear I was almost tripping off weed alone. It was real dark in my room and I noticed I could not see, I wasn't blind, but I just couldn't make out any objects and I saw vague colors, then I focused so I could climb up and put something away in the closet, and I could see fine again.

But like someone else said it was probably cause the E had some hallucinagin in it and the weed probably just increased the effects maybe.