system
Given the following post, respond as if you're commenting on Reddit:
human
Can insects see very small things like bacteria?

Can they see smaller things than us? How small?
gpt
Insects with compound eyes have what we would consider poor vision. They have a wide field of view, but see nothing clearly. Their eyes cannot focus like ours can. Each facet receives an unfocused image, but thousands of them together give a decent-enough view. The other thing to consider is that we have millions of photoreceptors in our eyes whereas insects typically only have thousands. Imagine the difference between QVGA (320x240=76800) video and 4K (3840x2160=8294400) video.