system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does your vision turn blurry/weird when you feel overwhelmed or anxious?
gpt
Back before you were born, your eyes developed as an offshoot of your brain. And like your brain, your eyes require a large amount of energy transfered by bloodflow.

When you are anxious or stressed, your fight or flight response sends hormones through your blood system to divert blood to your muscles. This allows you to act by fighting or fleeing. This diverts blood from elsewhere including your brain (can't think with full capacity) and your eyes (can't see at full capacity). This can result in blurred or weird vision.

Nowadays, stress and anxiety are caused by things that often cannot be fought off or completely escaped from. We have to remember we are not at full thinking or seeing capacity when we are stressed or anxious.