I have very poor eyesight due to a detached retina and subsequent surgery when I was a teenager. My vision in my right eye is 20/150 with glasses.

I was trying to touch up a spot on my left cheek and got a bit too close to the mirror trying to see what I was doing. When I bumped the mirror, the spike point dug out a nice 3/4" x 3/4" chunk of my face. A styptic pencil barely slowed the bleeding. I got it slowed down and went to work, but it kept weeping most of the day.