system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why can eyesight quality differ so much between your 2 eyes, considering that they both lived the exact same life?
gpt
bodies are not actually symmetrical, they are pretty good at looking like it though!  so there's some asymmetrical organs that influence each side differently as you grow and especially during illness. 

 then there is eye dominance, like handedness, on eye is usually used in preference to the other when only one is needed, like winking or looking through camera viewfinder. 

 also external factors can contribute alot, perhaps a fly flew in one, or chemicals were on one hand when rubbing both eyes tiredly.  even habitually sleeping so one eye is often pressed lightly on a pillow can influence them differently over time.  alot of healing happens while you sleep, try stretching your eyes before bed, without glasses, focusing to the stars and back as best you can, and massage gently round each, with clean hands of course!