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inventor Stephen Kurtin has developed the first manually adjustable lenses that let the wearer adjust from long distance to short distance viewing at the flip of a switch. The secret is a layer of liquid within the lens that changes shape depending on the situation. Called TruFocals, the glasses are composed of two components, a rigid plastic or glass lens, and a clear liquid that also acts as a lens. A slider on the top of the frame's bridge compresses the liquid, changing the shape and focus of the liquid lens, and thus the distance of focus for the wearer.