What is the lens in our eyes?

Focusing element. Normal eyes have a lens inside which helps provide a focused image on the back of the eye. It also in younger people is adjustable for focusing near and far.
Focusing. Crystalline structure sitting behind the pupil opening that bends light to focus it on the retina. It accommodates to adjust to see things near and far and works together with the cornea as the refractive power of our eye.