What are the black bars beneath American Footballer's eyes are used for? - Sports Stack Exchange

I often see football players with black bars right under their eyes. I can't figure out a reason why they are necessary. What are they used for?

A public data set of spatio-temporal match events in soccer competitions

Eye black - Wikipedia

Why so Many Athletes Wear Black Marks Under Their Eyes

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If there was a definition for soccer that could be referred to a player, which football (soccer) player would you choose? - Quora

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