Figure 1: One version of the test was unmodified to measure baseline performance (top image), whereas in the other two versions, a simulated visual field defect in the superior (left image) and inferior (right image) visual field moved with the participant’s gaze (red dot). Example screenshots taken from the three versions of the Hazard Perception Test. The visual field defects used for each test situation are shown beneath each image. (Images courtesy of Dr Fiona C. Glen, PhD.)