In the blind spot where the optic nerves leave the eye,

Good vision depends on adequate intake of carotene-rich food. Select the most appropriate option from the following statements.
$I.$ Vitamin $A$ derivatives are formed from carotene.
$II.$ Photopigments are embedded in the membrane discs of the outer segment.
$III.$ Retinal is a derivative of Vitamin $A$.
$IV.$ Retinal is a part of all photopigments that absorb light.

Following are various structures/regions of the human eye. Choose the correct option with respect to the sequence of the passage of light for the formation of an image:
$(A)$ Cornea
$(B)$ Lens
$(C)$ Aqueous humor
$(D)$ Pigment epithelium of retina
$(E)$ Conjunctiva

Daylight (photopic) vision and colour vision are functions of $P$,while twilight (scotopic) vision is a function of $Q$.
$\quad\quad \quad P\quad\quad\quad Q$

Short-sightedness or myopic vision is corrected by wearing:

The middle layer of the human eye,the choroid,contains $A$ and looks $B$ in color. Choose the correct option for $A$ and $B$.