The eye lens is

The correct option is Biconvex.

The lens of the human eye is a transparent, flexible structure located directly behind the pupil and the iris. In terms of physical shape, it is thicker in the middle than at the edges, and curved outwards on both its front (anterior) and back (posterior) surfaces. This specific geometry is known as a biconvex or double convex lens.

The primary function of this biconvex shape is to refract (bend) incoming light rays and focus them precisely onto the retina at the back of the eye. Because the surfaces on both sides curve outward, the lens acts as a converging lens, bringing parallel rays of light together to form a sharp, inverted, and real image on the retina.