system
Given the following post, respond as if you're commenting on Reddit:
human
How come we often squint our eyes in order to see more clearly? It seems to have the desired effect but why?

I've noticed myself doing this more often, especially in order to see things further away. It seems to make objects appear clearer... but how?
gpt
Reducing the aperture of the pupil (which reduces the area where light can come from), increases the focal depth since there is less ambiguity in where each photon can have come from. It is exactly the same principle as in camera lenses.