<Tr> <Th> FMA </Th> <Td> 58241 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> The 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 . </P> <P> The lens is also known as the aquula (Latin, a little stream, dim. of aqua, water) or crystalline lens . In humans, the refractive power of the lens in its natural environment is approximately 18 dioptres, roughly one - third of the eye's total power . </P>

What part of the eye is the lens