The human eye lens is:

The pupil becomes bigger to allow more light during dark by the:

Which of the following statements is correct?

Match List-$I$ with List-$II$ with respect to the human eye.

List-$I$	List-$II$
$A$. Fovea	$I$. Visible coloured portion of eye that regulates diameter of pupil.
$B$. Iris	$II$. External layer of eye formed of dense connective tissue.
$C$. Blind spot	$III$. Point of greatest visual acuity or resolution.
$D$. Sclera	$IV$. Point where optic nerve leaves the eyeball and photoreceptor cells are absent.

Choose the correct answer from the options given below:

Which of the following statements is correct regarding the pupil of the human eye?
$(I)$. It is the aperture surrounded by the iris.
$(II)$. The diameter of the pupil is regulated by the muscle fibres of the iris.
$(III)$. It is a transparent crystalline structure attached to the ciliary body.
The correct option is:

Ciliary muscles are found in