OK, so I used to work for a mining company and a natural gas company before that. Safety was everything. At the mining company, it was a good year when only 1 or 2 people died (over 100k employees, but still we wanted no injury years. Never got one.)
They lectured on safety, bought us all sorts of safety equipment, handed hearing safety and vision safety equipment like candy. I had no idea what the stuff cost till I left their employ.
My father was deaf (passed past away last fall at 94). Doctor said it was from the artillery in WWII (Occupation Forces, Japan). Needless to say, I've protected my hearing. Same for the eyes. I only get one pair and I really want to keep them.
ANSI Z87.1 standard equipment isn't expensive either. Personally, I use the 3M glasses at the Range and Peltor muffs, with 3M ear plugs when I can get them (I typically double up on ear protection). At home, muffs, and safety glasses.
Problem with just sun glasses is that if they get hit, they can shatter into your eyes. Odds of happening are pretty slim, but can happen.
After so many years in mining and natural gas, safety drilled into me for years on end, it's second nature and I'd recommend everyone spend a few bucks on decent equipment. A good set of muffs with a 25 db reduction is a whopping $6 on Amazon
Glasses start at something like $3 and go up from there.
Amazon sells glasses in a 12 pack for about $25
so, please protect yourself. It's cheap and on the really off chance something happens, the injuries might not be as bad as they could be.
stay safe out there!