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Fig. 2 | BMC Neurology

Fig. 2

From: Assessing migraine patients with multifocal pupillographic objective perimetry

Fig. 2

Objective measurement of the visual fields. a Schematic of the objectiveFIELD Analyser® (OFA). Stimuli are presented independently on two liquid-crystal displays (i). The images are reflected by two dichroic mirrors (ii) allowing infrared light to pass while reflecting shorter wavelengths. Plano-convex lenses set the viewing distance to optical infinity (iii). Each eye views only one monitor, the images being fused by the subject into a cyclopean view. Infrared illumination of the eyes is provided by infrared light-emitting diodes (iv) which allows monitoring of each pupil by infrared video cameras (v). Pupil diameters are extracted in real-time and recorded by a computer (vi). b The 44 stimulus regions/eye are arranged in a dartboard-like polar layout extending out to 30° from fixation. Stimuli are pseudo-randomly presented to each hemifield of each eye in a consecutive series. c shows the randomised volleys of independent dichoptic stimuli across a series of video frames of the test sequence. Along with a fixation cross a faint stationary background starburst pattern assists the subjects to fuse the images

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