You're not wrong - the cornea (front of the eye) has about 3x the refractive pow... | Hacker News

Hacker Newsnew | past | comments | ask | show | jobs | submit

		uj8efdkjfdshf on Sept 1, 2021 \| parent \| context \| favorite \| on: Man can change his pupil size on command You're not wrong - the cornea (front of the eye) has about 3x the refractive power of the lens. Both function as converging lenses, and the only difference is that the refractive power of the lens can be changed.

SomeHacker44 on Sept 1, 2021 [–]

...until age 45 to 50ish, when the lens hardens into a focus close to infinity and you start to need reading glasses. (presbyopia)

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact