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Show 'Blackout' Glasses Sun glasses that really do black out things are the newest of sun-protectors sun-protectors devised to aid the wearer guard his eyes effectively in any form of brightness. They are lenses of polaroid glass, set in spectacle-style spectacle-style shell frames and are immovable. immov-able. A movable lens is behind each lens which can be turned to admit more or less light. At the present time they are expensive, the manufacturers say, but are invaluable invalua-ble in preventing eyestrain and headaches caused by extreme outdoor out-door brightness in any season. |