I remember starting a book about 15 years ago where a boy protagonist ends up on an alien spaceship where his body is taken apart (he is eventually reassembled; the aliens are not malicious)...I vividly remember a description of his eyes being outside of his body looking at himself. It sounds strange out of context, but does anyone remember what this is from?
There is a scene in My Teacher Glows in the Dark, book three of the My Teacher Is an Alien series by Bruce Coville, where Peter agrees to let the aliens examine his brain. At one point, he gets woken up and the doctor - who Peter refers to as "CrocDoc" - shows him his own brain in a jar.
See page 114.
This scene always stood out to me because, when they put him back together, CrocDoc had casually fixed his nearsightedness, and 10-year-old me was insanely jealous.