Hasn't happened to me as I wear glasses, but unfortunately I've seen this happen 3x to others when playing in the past few months. Fortunately, the injuries were superficial and not serious. Several ways to avoid them. 1. Wear glasses or eye protection! Simple as that. 2. If you're at the front and your opponent is about to net kill, TURN OR COVER YOUR FACE with your racket immediately. Safer to concede that point than to try to save it. At that close distance, you have no time to react, the hit will be very forceful and you can't depend on your opponent to have the skill to avoid hitting you. 3. If your partner is behind you and is just about to hit a shot, NEVER TURN BACK TO LOOK. Again at that close distance, you have no time to react, the hit will be forceful, and you can't depend on your partner to have the skill to avoid hitting you. Again, be safe on the court as we all want to play this sport for a long time.