The
crystalline lens is a transparent,
biconvex structure in the
eye that, along with the
cornea, helps to
refract light to be
focused on the
retina. The lens, by changing shape, functions to change the
focal distance of the eye so that it can focus on objects at various distances, thus allowing a sharp
real image of the object of interest to be formed on the retina. This adjustment of the lens is known as
accommodation (see also below). Accommodation is similar to the focusing of a photographic camera via movement of its
lenses. The lens is more flat on its anterior side than on its posterior side.