system
Given the following post, respond as if you're commenting on Reddit:
human
Does the act of squinting to see something really small or far away really help? If so, why?

It is a pretty universal reflex among many animals it seems. Is there a reason for this?
gpt
Yes, it does. Squinting creates a slit that rejects out of focus light. 

In the old days, kids played with pinhole cameras, where the "lens" was just a small aperture.

If you're near-sighted, you can convince yourself that an aperture can help you see distant objects by forming a small pinhole with your fingers and looking through it.