The lens lies just behind the pupil in the eye and is protected in front by the aqueous fluid which exists between it and the cornea. The lens is held in place by a ligament attached to the ciliary muscle located at the front part of the eye. The lens refracts light to focus a sharp image on the retina. In a healthy person, the muscles of the elastic lens can change its shape to bring objects at different distances into focus. When looking at a distant object, the ciliary muscle relaxes and the lens has only a slightly curved shape. To focus on a near object, the ciliary muscle must contract, causing the lens to become more bulging and curved. However, if the eyeball is shaped so that the retina is too near or far from the lens, objects will appear out of focus. Research Lens
Abbreviations
Medicine
Research Lens