What is Horner syndrome?

Updated: May 01, 2019
  • Author: Christopher M Bardorf, MD, MS; Chief Editor: Edsel Ing, MD, MPH, FRCSC  more...
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Answer

Answer

Horner syndrome (Horner’s syndrome or oculosympathetic paresis) results from an interruption of the sympathetic nerve supply to the eye and is characterized by the classic triad of miosis (ie, constricted pupil), partial ptosis, and loss of hemifacial sweating (ie, anhidrosis), as well as enophthalmos (sinking of the eyeball into the bony cavity that protects the eye). The term Horner syndrome is commonly used in English-speaking countries, whereas the term Bernard-Horner syndrome is common in France. Von Passow syndrome is an association of Horner syndrome with iris heterochromia (heterochromia iridis). [1]


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