Question

What is the function of the iris in the human eye?

• A. Iris restricts the light to pass through the eye over to the retina.
• B. Iris provides protection to the eye from microorganisms.
• C. Iris controls the size of the pupil and hence the amount of light entering the eye.
• D. Iris allows color detection in the eye.

Answer 1

The correct option is C

Iris controls the size of the pupil and hence the amount of light entering the eye.

The correct option is C.

Explanation of correct option:

1. Iris is the colored structure in the human eye that contains a pupil in the center.
2. It helps in opening and closing the pupil, by which the quantity of the light entering through it is regulated.
3. Also, the iris employs muscles to adjust pupil size.

Explanation of incorrect options:

Option A:

1. Iris does not restrict the light passing through the retina.
2. Instead, it helps in the regulation of the amount of light entering the eye.

Option B:

1. The sclera, the white color coating of the eye, helps protect the eyes from microbes.
2. Iris does not have any role in the protection of the eyes.

Option D:

1. Cone cells of the retina help in color detection.
2. Iris is not responsible for color detection.

Final answer: The function of the iris in the human eye is to control the size of the pupil and hence the amount of light entering the eye.