system
Given the following post, respond as if you're commenting on Reddit:
human
Why does eye color change if you have blue/green eyes?

Is there a reason to it? And how does it happen?
gpt
It has to do with the dilation of the pupil.

When the pupil dilates it also causes the Iris (the colored part of the eye) to compress a tiny bit. Because of this the eye tends to appear as though its different colors at different times.