vagfilm
QuasiUnaFantasia because the inability of eyes to focus will lead to a lot of adjustments, which require muscular work. Fatigue seems a logical consequence.
In fact, there is some neuroscientists that hold the theory that pain (fatigue) does not come from stress (as in "muscular work") but is a warning signal about sensorial incongruences. Phantom limb pain is one example: stump nerves say "you have a leg" while the eyes say "no, you don't..." Pain does not solve the incongruence, but focus our attention to its importance. The same could be said of uncommon sensorial experiences.