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The design based on the eyeglasses frame provides for a split field of vision: the central field through the lenses, providing a vertical view to the climber; the peripheral field around the sides of the lenses, allowing the belayer to remain aware of their surroundings.
Cut glass or cut-glass is a technique and a style of decorating glass. For some time the style has often been produced by other techniques such as the use of moulding, but the original technique of cutting glass on an abrasive wheel is still used in luxury products. On glassware vessels, the style typically consists of furrowed faces at angles ...