Sunglasses

[Tarheels]

What is the ruling for wearing sunglasses for the players in a game? I was not at the game but a umpire made all the players take off there sunglasses.

This is at the 11-12 year olds and one of the players who was pitching at the time has very sensative eye and the doctor recommends that he wears sunglasses when he is outdoors.

What would be the ruling?

Thanks