The best defense against eye injuries is to prevent them. Ninety percent of trauma-related blindness can be prevented by using simple precautions, such as using protective eyewear.
Just as you protect your skin from sun damage by using sun block, you need to protect your eyes from the sun as well. Use sunglasses whenever going outside, even when the sky is overcast.
Protect your eyes during any kind of sports or any activity where you are subject to flying debris (such as mowing the lawn or chopping wood). For these activities, use only certified safety eyewear.