Joints and muscles – Clip

The iris is an involuntary muscle that controls the pupil size in the eye. It adjusts by contracting and relaxing to regulate the amount of light entering the eye, aiding in clearer vision.

What role does the iris play in the functioning of the eye?

What happens to the pupil size when the iris muscles contract?

How do the iris muscles adjust the amount of light entering the eye?

Why is it important for the iris to constantly adjust the light entering the eyes?

In what way does the iris contribute to clearer vision?