Talk:Mydriasis: Difference between revisions

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RE: Mydriasis is "mainly caused by stimulation of the sympathetic system"

To say that mydriasis is "mainly caused by stimulation of the sympathetic 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)[reply]

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)[reply]

Hallucinations caused by mydriasis

The dilated pupil takes in more light and this I believe plays a part in the hallucinations (especially increased brightness and vividness of color)created by psychedelic drugs that dilate the pupil,(like LSD, psychedelic mushrooms, mescaline, MDMA, Datura stramonium.) Is there any research on this?

You can believe that, but it's unfounded and somewhat fantastical. Thus, there would be no research to back this up, sorry. I think everyone who has consumed a psychedelic has come up with some hallucinogen-inspired hypothesis as to what mechanism is responsible for the actual hallucinatory response. I remember a long and tedious conversation with someone who believed: "It's all about memory, man... it like, changes your memory from second to second. So that everything changes. Yeah." So... yeah. 76.114.172.199 11:11, 31 July 2007 (UTC)[reply]

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-==RE: Mydriasis is "mainly caused by stimulation of the sysmpathetic system"==
+==RE: Mydriasis is "mainly caused by stimulation of the sympathetic 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. [[User:Edwardian|Edwardian]] 20:33, 3 September 2005 (UTC)
+To say that mydriasis is "mainly caused by stimulation of the sympathetic 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. [[User:Edwardian|Edwardian]] 20:33, 3 September 2005 (UTC)
-Is excessive overdilation of the pupils damaging to the eye?
+==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. [[User:82.93.133.130|82.93.133.130]] 11:27, 30 November 2006 (UTC)