What is a characteristic feature of the human cornea?

The light-sensitive chemical substance for vision in mammals is called:

The muscles of the iris and ciliary body are derived from the:

Myopia (near-sightedness) in the human eye is a defect in which the image is formed...

In the myopia eye defect,the rays of light

Which of the following statements are correct for the iris?
$(I)$. The ciliary body extends forward to form the iris.
$(II)$. It is a pigmented and opaque structure.
$(III)$. It is the visible coloured portion of the eye.
Choose the correct option.