Phenylephrine eyedrops as a diagnostic test in equine grass sickness

C N Hahn, I G Mayhew

Research output: Contribution to journalArticlepeer-review


The effect of an ocular administration of the alpha-1 adrenergic agonist phenylephrine was studied in 23 cases of grass sickness and 12 control horses. In the horses with grass sickness there was a significantly greater mean increase in the size of the palpebral fissure, as measured by the change in the angle of the eyelashes to the head observed from a frontal view.
Original languageEnglish
Pages (from-to)603-6
Number of pages4
JournalVeterinary Record
Issue number21
Publication statusPublished - 18 Nov 2000


  • Adrenergic alpha-Agonists
  • Animals
  • Autonomic Nervous System Diseases
  • Blepharoptosis
  • Case-Control Studies
  • Horse Diseases
  • Horses
  • Ophthalmic Solutions
  • Phenylephrine
  • Poaceae
  • Predictive Value of Tests


Dive into the research topics of 'Phenylephrine eyedrops as a diagnostic test in equine grass sickness'. Together they form a unique fingerprint.

Cite this