system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does pushing on your closed eyelids gives you weird visions?

I can feel even depth of it (no drugs involved) and it's really weird, because i can see sometimes similar visions.
gpt
Increasing the pressure inside the eyeball (eg. by gently pressing on them, raising blood pressure due to coughing or exertion, etc.) directly stimulates the cells of the retina, causing them to signal as if they were detecting light.  These non-light images are called 'phosphenes'.