Abstract: A visualization training device with adjustable electro-optical shutters comprises a pair of goggles (10) and a control unit (20). The goggles have a single lens made of an electro-optical shutter (11) which uses liquid crystals as the light valve. The control unit produces a square wave which alternately drives the shutter opened and closed. The opening and closing cycles are adjustable in duty cycle and frequency via a duty cycle control knob (21) and a frequency control knob (22). When the shutter is opened, it is transparent so that the user has a panoramic view of external visual information. When the shutter is closed, it becomes an opaque white to occlude the visual information from the user, so that the user must mentally visualize the previous information. The opening and viewing, and closing and visualizing cycle is repeated to train and improve the visualization ability of the user.