A clear disk that focuses light, as in a camera or microscope. In the eye, the lens is a clear, curved structure at the front of the eye behind the pupil. It focuses light rays that enter the eye through the pupil, making an image on the retina (light-sensitive layers of nerve tissue at the back of the eye).
Definition from: Cancer.govAnatomy of the eye, showing the outside and inside of the eye including the eyelid, pupil, sclera, iris, cornea, lens, ciliary body, retina, choroid, vitreous humor, and optic nerve. Anatomía del ojo; se muestra el exterior e interior del ojo con el párpado, la pupila, la esclerótica, el iris, la cornea, el lente, el cuerpo ciliar, la coroides, la retina, el humor vítreo y el nervio óptico.2008-03-28