The cornea of the human eye

Concept: The pupil is a hole in our eye that allows light to enter.
It regulates the quantity of light that enters the eye.
The iris is a muscle in our eyes that regulates the size of our pupils. It dilates and contracts, causing the pupil size to change.

As a result, we may conclude that Iris regulates the size of the pupil.
Cornea: Cornea is the translucent frontmost coating of the eye.
The cornea allows light to enter the human eye.

Proteins and cells make up the cornea.

Unlike most other tissues in the human body, it lacks blood vessels.
Aqueous Humor is the clear, watery, and translucent fluid that circulates in the front region of the eye.

Aqueous humour is a fluid or transparent window within the eye that maintains consistent pressure and further nourishes the cornea and lens. The human eye is made up of proteins and cells, with a thin membrane in the front that allows light to enter. It is known as the cornea. As a result, option 4 is right.