Acute vision is found in ................

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.

Iodopsin is a light-sensitive pigment and is present in the

In eye donation,which one of the following parts of the donor's eye is utilized?

In the human eye,the image formed on the retina is:

Which muscles are present in the structure of the iris?