system
Given the following post, respond as if you're commenting on Reddit:
human
Why does it take so long for eyes to adjust to changes in light when pupils can quickly constrict and dilate?
gpt
Pupils adjust for some changes quickly. Night adaption is a chemical process that takes about half an hour in the retina itself, this happens after the pupil has fully dilated.

Wikipedia has more details on the process, am on tablet so hyperlinks are a pain.