In hypermetropia,the image is formed

The optic nerve is the:

The retina of nocturnal birds contains:

Which of the following structures of the eye can be artificially implanted?

Choroid is

Good vision depends on adequate intake of carotene-rich food. Select the best option from the following statements:
$(1)$ Vitamin $A$ derivatives are formed from carotene.
$(2)$ The photopigments are embedded in the membrane discs of the inner segment.
$(3)$ Retinal is a derivative of vitamin $A$.
$(4)$ Retinal is a light-absorbing part of all the visual photopigments.