The LEA Flicker Wand is 26.5" (67.3 cm) long with a 20" (50.8 cm) flexible wand with a diode at the end that can be used as either a flickering or non-flickering stimulus at 4, 40 and 400 cd/m2. The curved wand is moved from behind the person forward in all four quadrants of the visual field to detect losses in the periphery of the visual field.