system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why do our eyes imprint the outline of images and portray them behind closed eyelids after staring at, say, a window or the sun?
gpt
Our eyes don't see in the same way modern cameras do. They have chemicals in them that get consumed when light hits them. These chemicals are constantly being replenished so it is rarely an issue, but when you go from something very bright to darkness, you can see where the chemicals in your retinas are depleted.