2006-12-26 03:59:36 · 2 answers · asked by aviad 1 in Science & Mathematics ➔ Biology
There isn't alot of information this but it is believed that the sympathetic nerve tone is diminished with age - like all our reflexes even these reflexes decrease with age. The symathetic nervous system is responsible for dilating the eyes.
My information is confirmed by a text called "Clinical Geriatric Neurology." date 1993
2006-12-26 06:56:29 · answer #1 · answered by Cafegeek 2 · 0⤊ 0⤋
I think older people are generally larger so their "pupils" or "students" are going to be younger people. Young people are usually smaller.
I mean how many 5 year olds do you know that are as big as a 50 year old?
That's why older people have smaller pupils!
2006-12-26 04:09:19 · answer #2 · answered by songndance1999 4 · 1⤊ 0⤋
Define older! Do you mean adults vs. children, children vs. infants, 70-80yr olds compared to 20-30 year olds?
Anyway...pupil size is a function of the amount of light hitting the eye. More light, smaller pupil; less light, larger pupil. See http://www.stlukeseye.com/anatomy/Pupil.asp
2006-12-26 06:01:33 · answer #3 · answered by teachbio 5 · 0⤊ 0⤋