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Horner's syndrome

Other Names for this Disease
  • Bernard-Horner Syndrome
  • Oculosympathetic Palsy
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Horner's syndrome consists of miosis (constriction of the pupil), ptosis (drooping of the upper eyelid), anhidrosis (absence of sweating of the face), and enophthalmos (sinking of the eyeball into the eye socket).[1][2][3]  It is caused by injury to the sympathetic nerves of the face. In rare cases, Horner's syndrome is congenital (present from birth) and associated with a lack of pigmentation of the iris (colored part of the eye).[1]
Last updated: 3/6/2012


  1. Horner syndrome. MedlinePlus. February 13, 2008; Accessed 3/27/2009.
  2. Horner's syndrome. National Organization for Rare Disorders (NORD). 2003; Accessed 3/27/2009.
  3. Rolf Salvesen. Horner Syndrome. NORD Guide to Rare Disorders. Philadelphia, PA: Lippincott Williams & Wilkins; 2003;
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Basic Information

  • Genetics Home Reference contains information on Horner's syndrome. This website is maintained by the National Library of Medicine.
  • offers additional information about Horner syndrome. Click on the above link to access this information.
  • MedlinePlus was designed by the National Library of Medicine to help you research your health questions, and it provides more information about this topic.
  • The National Organization for Rare Disorders (NORD) is a federation of more than 130 nonprofit voluntary health organizations serving people with rare disorders. Click on the link to view information on this topic.

In Depth Information

  • Medscape Reference provides information on this topic. Click on the link to view this information. You may need to register to view the medical textbook, but registration is free.
  • The Online Mendelian Inheritance in Man (OMIM) is an catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
  • PubMed is a searchable database of medical literature and lists journal articles that discuss Horner's syndrome. Click on the link to view a sample search on this topic.