label: Lack of pupillary response to hydroxyamphetamine
label_lc: lack of pupillary response to hydroxyamphetamine
description: "4-hydroxyamphetamine is used in eye drops to dilate the pupil, e.g.., to induce mydriasis for fundus examinations. This term refers to a lack of response of the pupil to topical application of 4-hydroxyamphetamine."