I could use this reminder too

iOS 17 and iPadOS 17 include a new Screen Distance feature that can alert you when you hold an iPhone or iPad too close to your eyes for an extended period. Apple says the opt-in feature is designed to help lower the risk of nearsightedness in children by encouraging healthy viewing habits, and can help reduce eye strain overall.

I don’t go measuring my arm much, but 12” seems a little short. Kid arm, maybe.

Good feature, though.