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Wiktionary
eye black

n. (context US English) a grease smeared under the eyes of sports players to reduce glare from sunlight or stadium lights.

Wikipedia
Eye black

Eye black is a grease applied under the eyes to reduce glare. It is often used by American football, baseball, and lacrosse players, where sunlight or stadium lights can impair seeing an airborne ball.

It is a form of functional makeup or war paint.

Usage examples of "eye black".

It scuttled down to the floor, skipped over to me, grinned up with a One-Eye black face wearing no eye-patch, then zipped toward Goblin.