Eyes right

By Barry Fox Paul Moore and David Kerns of the US want to help tennis players and spectators at matches keep their eyes on the ball (W0 98/26326). The players use yellow tennis balls which have been treated with a fluorescent dye to make them glow in ultraviolet light. This comes either from natural sunlight, or UV-enhanced indoor lamps. Players and spectators can wear special glasses, or spectators can watch the game through a treated glass panel at the front of a stadium. In each case,
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