How many oblique and rectus muscles are present for the movement of the eyeball in various directions within the eye orbit?

The iodopsin which is in cones is sensitive for

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.

Which of the following is not correct for rods?
$(I)$. Twilight vision is the function of the rods
$(II)$. It is responsible for daylight vision sometimes
$(III)$. The rods contain a protein called rhodopsin
$(IV)$. Rods are photoreceptor cells
Choose the correct option

The highly vascular and pigmented layer of the rabbit's eye is .....

If a person has a deficiency of the visual pigment $Rhodopsin$, they are advised to consume more of which of the following?