Conversation so far:
what are the primary functions of the sympathetic and parasympathetic
The parasympathetic nervous system is responsible for the body's rest and digest function. The sympathetic nervous system controls is responsible for the fight or flight response.
What is the fight or flight response
The fight or flight response is a physiological reaction that occurs in response to a perceived harmful event, attack, or threat to survival
What happens to the digestive system during a fight or flight response
During a fight or flight response, there is inhibition of stomach and upper intestinal action to the point where digestion slows down or stops
What happens to the vision during a fight or flight response
The fight or flight response dilates your pupils so that you can see your surroundings better. If stress is heightened the high amount of adrenaline can cause tunnel vision.

Question: How about during the rest and digest mode
Self-contained rewrite: What happens to the vision during the rest and digest mode