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TUSA has devoted years of research to improving the diving mask's field of vision. The result is the new Direct Sashing System (D.S.S.), a totally new structure. It eliminates the inner frame that blocks the field of vision and attaches the lens directly to the frame to realize a startlingly new super-slim frame. The result is a major increase in the upper/lower and left/right visibility ranges. It also achieves a major narrowing of the center joints connecting the left and right lenses to eliminate the vision field split.
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