I Might Just Get an Eye Patch
(Above: Yes, I know that's not a pirate.)
The other day, I was reading about pirates (as I'm wont to do), and I came across an interesting "fact." Some pirate experts (can you imagine a better job?) claim that sailors may not have worn eye patches to look tough or to cover up injuries. Instead, the eye patch might have been a trade secret of sorts. If a sailor always kept one eye in the dark, that eye wouldn't need time to adjust when the sailor went below deck.
Interesting, right? (Perhaps you already knew?) Anyway, I was thinking that this might have a few practical applications for those of us who don't spend our days on the high seas. Perhaps you have some suggestions?