A perimeter of the present invention including: visual field scanning screen generating means; fixation image displaying and controlling means; visual target scan line parallel setting means; visual target displaying and controlling means; statically displaying and controlling means for a specific time; static display position storing means for a specific time; kinetic display and control starting means for giving rise to another of the visual target kinetically based on the start point of a specific time from the position which the static display position storing means stores; detecting means; detection position storing means; distance storing means; and scanning continuation means.