Adies tonic pupil
Adies tonic pupil is a neurological condition of unknown origin with an unusual, asymmetric presentation known as anisocoria, an inequality in the size of the pupils of the eye.
A result of damage to the nerve innervating a muscle of the eye known as the ciliary body. Alternately, the problem may be located at the ciliary ganglion, a kind of nerve junction structure from which the nerve to the ciliary body runs.
Accommodation, or the adjustment of the eye for distance, is affected, as well as pupillary dilation and contraction, the ability of the eye's iris to open. Accommodation, or the adjustment of the eye for distance, is affected, as well as pupillary dilation and contraction, the ability of the eye's iris to open or close in response to ambient light.
Activation of the near response in this situation produces a better near reaction than light reaction (light-near dissociation of the pupils), and the reaction is tonic.
It is caused by damage to the postganglionic fibers of the parasympathetic innervation of the eye, usually by a viral or bacterial infection which causes inflammation, and characterized by a tonically dilated pupil.
References
Adie's tonic pupil: Definition from Answers.com
http://www.answers.com/topic/adie-s-pupil
Adies Tonic Pupil: General Health - Australian Lifestyle Message Boards
http://www.au.messages.yahoo.com/lifestyle/general-health/30?p=3
Tonic Pupil: Up to date for patients
http://www.uptodate.com/patients/content/topic.do?topicKey=~4xxNsYPaPiTR1r
No comments:
Post a Comment