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Denny JC, Arndt FV, Dupont WD, Neilson EG. Increased hospital mortality in patients with bedside hippus. The American journal of medicine. 2008 Mar;121(121). 239-45.
Abstract
Hippus is a prominent, repetitive oscillation of the pupils. Although regarded by some as a normal variant of pupillary unrest, the clinical importance of hippus has not been investigated systematically in hospitalized patients.