Deficiency of vitamin $A$ causes ...... disease in human beings.

The defective condition of accommodation of the eye in which distant objects are seen distinctly but near objects are indistinct is:

The common eye defect that occurs in old age is .......

In hypermetropia,the image is formed

Read the following statements with respect to the human eye and select the correct option.
Statement $I$: Uvea is the middle,vascular,and non-pigmented layer of the eye that lies outer to the retina.
Statement $II$: The size of the lens can be adjusted depending on the distance of the object from the eye,through the muscles of the ciliary body and the suspensory ligament.

The nictitating membrane, also known as the $Plica \text{ } semilunaris$, is a vestigial organ present in which part of the human eye?