Aim: To assess differences in pupil diameter between men taking systemic α(1)-adrenoreceptor antagonists and controls.
Setting: University of Michigan clinics, USA.
Methods: Male patients over the age of 50 years were recruited from clinics over 3 months and divided into two groups: 18 study patients taking α(1)-adrenoreceptor antagonists (Flomax, Uroxatral, Cardura and Hytrin) and 31 control patients who had never been on them.