Hi, this blurry vision in one eye that comes and goes occurs only on days when i sleep in a certain room. what could the thing in that room be?

Blurry Mystery: This is somewhat unusual. If there is something in the room that you are allergic to and the vision is affected, both eyes should be affected. Another possibility is that one eye comes open some during sleep causing dryness, and maybe this room is dryer than others due to ceiling fans, etc. Possibly also an allergy to bed sheets that come in contact with one eye only. Try covering the eye at night.