Accommodation reflex 1157448 215969136 2008-05-30T14:13:57Z SmackBot 433328 Date the maintenance tags or general fixes The '''accommodation reflex''' is a [[reflex action]] of the [[eye]], in response to [[focus (optics)|focusing]] on a near object, then looking at distant object (and [[vice versa]]), comprising coordinated changes in [[vergence]], [[lens (anatomy)|lens]] shape and [[pupil]] size. It is dependent on [[optic nerve|cranial nerve II]] ([[afferent limb]] of reflex), higher centres and [[oculomotor nerve|cranial nerve III]]. [[Image:Focus in an eye.svg|thumb|right|Light from a single point of a distant object and light from a single point of a near object being brought to a focus.]] A near object (for example, a computer screen) appears large in the [[field of view|field of vision]], and the eye receives [[light]] from wide angles. When moving focus from a distant to a near object, the eyes converge. The [[ciliary muscle]] contracts making the [[lens (anatomy)|lens]] more convex, shortening its focal length. The [[pupil]] constricts in order to prevent diverging light rays from hitting the periphery of the [[retina]] and resulting in a blurred image. ==Pathway== Light from each retina is taken to the [[occipital lobe]] via the [[optic nerve]] and [[optic radiation]], where it is interpreted as vision. The [[peristriate area 19]] interprets accommodation, and sends signals via the [[Edinger-Westphal nucleus]] and the [[Oculomotor nerve|3rd cranial nerve]] to the [[medial rectus]] muscle{{Fact|date=May 2008}}. ==See also== *[[Accommodation (eye)]] *[[Ciliary muscle]] *[[Presbyopia]] ==External links== *[http://hyperphysics.phy-astr.gsu.edu/hbase/vision/accom.html Accommodation] at [[Georgia State University]] *{{MeshName|Ocular+Accommodation}} {{Reflex}} [[Category:Cranial nerves]] [[Category:Eye]] [[Category:Ophthalmology]] [[Category:Reflexes]] {{Neuroscience-stub}} [[tr:Akomodasyon refleksi]] [[uk:Акомодація ока]]