Question

Function of iris is to

• A. refract light rays.
• B. bring about movements of the eyeball.
• C. alter the size of pupil
• D. all of the above

Answer 1

The correct option is C alter the size of pupil

Iris is the coloured part of the eye which has an aperture called pupil. Iris is responsible for regulating the diameter of the pupil.
Refraction of light rays is the function of the cornea which is the transparent anterior portion of the external part of the eye called sclera.
Eye muscles are responsible for bringing about the movements of the eyeball.