I had a chance to go on a boating trip with a few of my old pals the other day. It was my first time and I didn't bring my sunglasses and it was a very bright day. I struggled to not squint my eyes until one of my good friends offered me a spare sunglasses. The relief on my eyes were amazing and I must remember to personally thank the inventor of sunglasses in the afterlife.

But it made me wonder. How did sailors before the invention of sunglasses (and sunscreen!) dealt with the problem? I know they probably wore hats but that didn't help much in terms of helping you look across the glimmering bright sea well. I've noted that black kohl are used by Asiatic nomads in arid areas but have no idea if Europeans or people in other places were aware of it (or if kohl did anything to help at all).

Thank you in advance