Subject fixes eyes at midpoint in the perimeter's semicircular while experimenter moves a pointer to identified by subject at his / her visual periphery. This device is used to map areas of the retina sensitive to different colored stimuli. Stand perimeter comes with semicircular perimeter device with fixation point, five targets (blue, green, yellow, red, and white), a wand for presenting targets, five right eye charts, five left eye charts, and stand.