Safety glasses with built-in magnification

I've owned these safety glasses for a long time. They're like regular safety glasses, but they have magnifiers at the bottom. I've found them to be useful when I use a rotary tool, bandsaw, or drill press. I can look down and see the details, and when I back up to see the big picture, it's not blurry because the upper part is not magnified. You can get them in a variety of strengths.