DetailsBott Wand 2 - Confrontation Peripheral Vision Eye Test The Bott Wand 2 is designed to assess the visual fields of a person. Confrontation visual field tests are use world-wide to test drivers fields of vision. It projects a flashing light at the end of wand to stimulate the peripheral retinal cells. It can accurately demonstrate small losses of peripheral visual loss and hemianopia. The test requires 2 AA batteries to power the instrument.