A cap (10) worn on the top of the wearer's head and shown in Figure 1, having two flaps (11,12) hinged under the peak (13) at (16) along the axis (14,15) and allowing for each flap (11,12) to be raised and temporarily fastened under the peak (13) alternately exposing each eye to clear vision or the restricted vision of an image of a flap which is sufficiently opaque to light to prevent the user from perceiving images through said flap.
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