Final answer:
A basketball player dribbling down the court usually doesn't need to keep his eyes on the ball because of muscle memory and peripheral vision.
Step-by-step explanation:
A basketball player dribbling down the court usually doesn't need to keep his eyes on the ball because of muscle memory and peripheral vision. With enough practice, the player develops muscle memory to control the ball without constantly looking at it. Additionally, the player can use their peripheral vision to keep track of the ball's position while also focusing on the players around them.