What is the function of Iris and Pupil?

Last updated at July 31, 2026 by

Iris automatically adjusts the size of Pupil according to the intensity of light.

Hence, the iris controls the amount of light entering the eye by adjusting the size of pupil.

Example

If light is bright, it reduces the size of Pupil,so that less light can enter the eyes

If light is dim, it increases the size of the pupil so that more light can enter our eyes

Function of Iris in dim and bright light - Teachoo.jpg

Note

Adjustment of the size of pupil takes time

If we come from sunlight into a dark room,we are not able to see anything for some time

 

Remove Ads
Maninder Singh's photo - Co-founder, Teachoo

Made by

Maninder Singh

CA Maninder Singh is a Chartered Accountant with 16+ years of practical experience and 20+ years of teaching experience. He teaches Science, Economics, Accounting and English at Teachoo using clear explanations and exam-focused methods students can trust.

For faster and distraction-free study, students can choose Teachoo Black.