One of the more complex variables of the visual system is understanding and training Depth Perception. As a standard definition, Depth Perception is the ability to perceive the world in three dimensions. If all we had to do in sports was "perceive information" it would be an easy thing to do, but sports is anything put simply perceiving the world. We have to process multiple objects, competitors, teammates, balls, bats, sticks, etc. often in a split second.
Take soccer for instance. When analyzing the corner kick, a keeper has to process the ball first and foremost. After they judges the spin on the ball, trajectory and motion, the goalie has to turn their attention to the surrounding players. The positioning of the goalie is paramount, which is why elite goalies have phenomenal Depth Perception! They see the three dimensional world in a much different way. They see the force of the kick, spin on the ball, which foot kicked the corner, all in a matter of a fraction of a second. This advantage helps the goalie get better positioning and an edge other soccer players don't experience.