Question

which of the following is not a layer of the eyeball?
a sclera
b lens
c retina
d choroid

Explanation:

The eyeball has three main layers: the outer fibrous layer (which includes the sclera), the middle vascular layer (which includes the choroid), and the inner nervous layer (the retina). The lens is an internal structure within the eye but not a layer of the eyeball.

Answer:

B. lens