system
Given the following post, respond as if you're commenting on Reddit:
human
Does the human eye's depth of field change with iris dilation?

In photography there's a metric called the F-stop that describes how wide the aperture of a lens is, and the narrower the F-stop, the wider the depth of field is (meaning more of a photo will be in focus). Is the same thing true of the human eye? Is more of a person's visual field in focus in brighter light when the iris is narrow (in photography terms, "stopped down") to restrict light coming in?
gpt
Yes.

You won't notice it because your eye flexes your lens to focus on what you are looking at, but the physics still applies: when you are in bright light and your pupil constricts, you get all the benefits of a small aperture. That's why old people like me can read small print at close distances in bright light.