Sunglasses should be worn outside during the day, even on overcast days, to protect eyes from UV light.

“for sure and sometimes you know this kind of came up during the recent eclipse because you know people were saying okay i'll look at the eclipse this one was a few years ago i'll just use sunglasses well that's actually much much much much worse because you're increasing the aperture of your pupil because everything is dim but you're letting through all this very damaging light because no amount of sunglasses could block a straight shot looking at the sun correct so i think even on a cloudy day i do recommend that people wear sunglasses”