Fig. 1From: A novel device for assessing dark adaptation in field settingsSchematic diagram of the Portable Field Dark Adaptometer (PFDA) developed to assess impaired pupillary responses to a graded series of Ganzfeld light stimuli applied within a pair of “dark-room” goggles (a,b) with an embedded microcircuit design (c) and regulated by a laptop-powered controller box (d)Back to article page