Abstract: The invention is concerned with an improved underwater swimming mask or goggles having a lens with an inner surface, a frame mounting the lens in spaced relationship to a swimmer's eyes and a water-excluding face-fitting skirt peripherally extending from the frame. The improvement comprises wiper means mounted for sweeping movement across a viewing area of the lens and in wiping contact with the lens inner surface, and weight means connected to and displaceable with the wiper means for moving same in response to tilting movements of the mask or goggles when worn by the swimmer during swimming. The tilting movements resulting from the swimmer rotating his head from side to side cause the weight means to be displaced by gravity and to thereby move the wiper means therewith so as to dissipate mist or droplets of water collected on the lens inner surface and to clear the viewing area of the lens.