12. Mismatched Pupil Sizes
Blogspot
People’s pupils – the black circles in the center of the eyeball – are usually meant to be the same size, which is between 2 to 4 millimeters in diameter in bright light, and 4 to 8 mm in the dark. Pupils change based on what you are looking at, whether near or far. Moreover, it’s not something that people can control either, but it’s an involuntary response to outside stimuli for the most part. When someone has unequal pupil sizes, this is called anisocoria, which on its own isn’t serious, but it could be a clue into a bigger health issue, such as a torn or blocked blood vessel, a third nerve palsy, or a brain aneurysm, which can be fatal when left untreated.
