I don't know the details of how, but we had a 7 years kid from our church get a hook in his eye a few years ago. It was removed with no long term harm but it made everyone hold their breath for a little while. A pair of glass would have prevented it. I recently did not take the time to find my safety glasses in my home workshop and had to wash a piece of aluminum sawdust out of my eye. I know better for sure.