Look, you could go jogging, trip over something, hit your head on the sidewalk and die. Everything you do can result in "shooting your eye out".
The chance of Losing your eye during a tennis match so remote that it would be more productive to worry about the tax you will pay when you win the next lottery. You can roll over your ankle reaching wide or behind for a ball FAR more often. Does that mean we should all refrain from hitting the ball away from the opponent because that if FAR more likely to injure your opponent than hitting right at them?
If you are on the court, you can/will get hit. It is part of the game. Trust me, it won't hurt in 99.9999% of the case. Just play the game.