Anisocoria

When anisocoria ( adjective: anisokor, from the Greek a (n): alpha privative, isos: equal, kore: pupil) means a difference in the pupillary diameters of the eyes. In contrast, Isokorie is ( adjective: isokor ) for the equality of the pupil sizes.

Up to one millimeter difference between the sides in healthy eyes is possible. Cause of a side difference in pupil size can be either unilateral central paralysis ( hemiparesis ), intracranial pressure or extracranial muscle or regulation errors. In addition to a craniocerebral trauma with homolateral Subduralblutung, even strokes, tumors or Horner's syndrome can be the cause of this effect. The pupil size is parasympathetic innervation ( from Ncl. Accessory nerve oculomotorii, Edinger - Westphal nucleus ) of the oculomotor nerve (III) and sympathetic counter-regulation, through out the neck ganglia ( superior cervical ganglion ) Ascending fibers regulated.

In addition to neurological disorders of the efferent and local causes of anisocoria can be decisive. These include, for example, restrictions on movement of the iris by Sphinkterrisse or synechiae.