Pets

She can see through it, though not as clearly. I looked through one once. Somewhat diminished vision's a good trade-off for keeping flies out.

Now Pete. He's another story. Laurie has seen him rub his fly mask until it falls off. It seems he doesn't mind the flies. Eventually we'll find the mask out in the pasture and put if back on. But probably not for long.
Thank You for asking!