Talk:Mydriasis

From Wikipedia, the free encyclopedia

	This article is within the scope of WikiProject Medicine. Please visit the project page for details or ask questions at the doctor's mess.
Unassessed	This article has been rated as Unassessed-Class on the assessment scale.
???	This article has not yet received an importance rating within Medicine. Please rate the article.

[edit] RE: Mydriasis is "mainly caused by stimulation of the sysmpathetic system"

To say that mydriasis is "mainly caused by stimulation of the sysmpathetic system" is not entirely correct. SNS directly causes mydriasis and PNS interruption indirectly causes mydriasis - neither action is the main one. I'm not a neurologist but I believe mydriasis, whether pharmacologically induced or due to injury or other pathology, due to an interruption or blockade of the the parasympathetic system is much more common. I'm pretty sure tropicamide (PNS inhibitor) will usually open a pupil more than pilocarpine (SNS stimulant), too. Edwardian 20:33, 3 September 2005 (UTC)

Is excessive overdilation of the pupils damaging to the eye? There should be a section either saying it is or isnt.... but i dont know the answer.

One would assume that constricting of the pupil is for both sight and safety reasons. We know bright light for prolonged times can damage the eye (arc eye or sun eye). A permanently dilated pupil would excellerate these effects, no? Needless to say, having mine dilated for only a few hours is pretty painful without sunglasses. 82.93.133.130 11:27, 30 November 2006 (UTC)