Family Practice Notebook: Horner's Syndrome 
The pathophysiology, causes and signs of horners syndrome.
http://www.fpnotebook.com/NEU1.htmHandbook of Ocular Disease Management - Horner's Syndrome
An article about the signs, symptoms, pathophysiology, management and clinical pearls.
http://www.revoptom.com/handbook/sect6g.htm
NORD: Horner's Syndrome
Offer the synonyms, a general discussion and further resources.
http://www.rarediseases.org/search/rdbdetail_abstract.html?disname=Horner%27s%20Syndrome
