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A new look for bifocals Do you wear bifocal spectacles and get frustrated at having to move your gaze between the upper and lower lenses as you switch from far to near vision? If so, help could soon be at hand thanks to a new lens developed by optical scientists in the US. It consists of a layer of liquid crystal sandwiched between two glass surfaces, the focusing power of which can be changed by altering the voltage applied to the lens.
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