The anterior portion of the sclera is called the .......

The density of the vitreous humour is approximately equal to that of the:

Which of the following results in the generation of potential differences in the photoreceptor cells of eyes?

The central opening of the iris is called:

Cone cells are sensitive to which main colors?

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.