What is Lens (anatomy)?
{{Infobox anatomy | Name = Lens | Latin = lens crystallin | Greek = | Image = Focus in an eye.svg | Caption = Light from a single point of a distant object and light from a single point of a near object being brought to a focus by changing the curvature of the lens. | Width = | Image2 = Schematic diagram of the human eye en-edit.png | Caption2 = Schematic diagram of the [[human eye]]. | Precursor = | System = | Artery = | Vein = | Nerve = | Lymph = }} The '''crystalline lens''' is a [[transparent]], [[Lens (optics)#Types of simple lenses|biconvex]] structure in the [[eye]]. With the [[cornea]] it helps to [[refraction|refract]] [[light]] to be [[Focus (optics)|focused]] on the [[retina]]. The lens changes shape. This changes the [[focal length|focal distance]] of the eye so that it can focus on objects at various distances. This adjustment of the lens is called [[Accommodation (eye)|accommodation]]. It is similar to the focusing of a photographic camera when it focuses its [[Photographic lens|lenses]]. The lens is flatter on the inside. The lens is also called 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 [[dioptre]]s. This is about one-third of the eye's total power. ==Related pages== *[[Melatonin]] *[[Visual perception]] * [[Cataract]] {{-}} {{biology-stub}} [[Category:Eye anatomy]]