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Clinical features

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

Horner's syndrome comprises:

  • ipsilateral miosis and partial ptosis
  • ipsilateral anhidria on the face
  • there is no enopthalmos, although the narrow palpebral aperture may suggest it

Also:

  • despite the ptosis - normal range of lid movement in and up and down movement - supplied by the third nerve
  • despite the miosis, the pupillary response to light and the near reflex are brisk and sustained but dilation of the Horner's pupil in response to darkness is diminished or absent
  • the degree of miosis is not related to the level of the lesion i.e. whether central, pre- or post- ganglionic

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