The choroid is thin over the posterior two-thirds of the eyeball,but it becomes thick in the anterior part to form the:

Conjunctiva is a

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.

Where is the pigmented epithelium found?

In humans,presbyopia is an eye defect that occurs with aging,in which ....

In the mammalian eye, the 'fovea' is the center of the visual field, where