What is dilated Pupil?
http://en.wikipedia.org/wiki/Dilated_pup… (This link has pictures…) Mydriasis is an excessive dilation of the pupil due to disease, trauma or drugs. Normally, the pupil dilates in the dark and constricts in the light. A mydriatic pupil will remain excessively large, even in a bright environment. Sometimes colloquially referred to as a “blown pupil.” The opposite, constriction of the pupil, is called miosis. *****Causes***** **Pathological The parasympathetic nervous supply which causes constriction of the pupil, or miosis, is supplied by cranial nerve III, the oculomotor nerve. Damage to this nerve typically manifests itself as mydriasis, because the sympathetic supply to the pupil which causes mydriasis remains unaffected, and therefore unopposed. **Traumatic In cases of head or orbit trauma, the iris sphincter (the muscle which is responsible for closing the pupil) or the nerves controlling it can be damaged,
