A

The human eyeball consists of three main layers of the eye are: (1) the outermost supporting layer, which is composed of the clear cornea, the opaque sclera, and their zone of interdigitation, known as the limbus; (2) the middle uveal layer, which is composed of the iris, ciliary body, and choroid and constitutes the central vascular layer of the globe; and (3) the interior layer, which is commonly referred to as the retina.