Figure 5
From: Using eye movements to detect visual field loss: a pragmatic assessment using simulated scotoma
Apparatus, stimuli, and procedure. (a) The experiment apparatus consisted of an LCD monitor (51 × 25.5 cm; 1,920 × 1,080 pixels; 60 Hz) with an integrated eye tracker. Participants viewed the screen binocularly and were seated at approximately 60 cm away from the eye tracker without a head/chin rest, meaning that the screen subtended at a visual angle of 46° × 24°. The eye tracker allows for moderate head movements of up to 37 cm (width) × 17 cm (height) when operating at the distance of 65 cm. Participants were required only to look at the screen during test trials (no explicit response). A keyboard was used between trials to indicate readiness to continue. Changes in viewing distance were monitored using the eye tracker and the size of the artificial VF loss was dynamically adjusted accordingly. (b) The stimuli consisted of two video clips and three static images (only the images shown here), the latter of which were displayed for 60 seconds each. The two videos were presented for their full duration of 301 seconds and 307 seconds, respectively. The resolution of video and the images were presented at a resolution of 1,280 × 720 pixels and the frame rate of the two videos were 30 frames/second. All stimuli were displayed in a full-screen mode (resolution of 1,920 × 1,080 pixels). Stimulus order was randomised between participants. The first image (beach scene) was downloaded from http://genchi.info/beach-wallpaper-1920×1080 in March 2019.
