Look up polycarbonate's properties and you will find that the data shows polycarbonate blocks pretty much all UV, even when that material is clear (no tint). And almost all safety glasses are made of that material because of it's resistance to shattering. But there may be a question as to that with regards to the lower (more visible) frequencies.
I kite from about 39°N to 46°N
I have used sunglasses since I was 9years old. I went to polarized lenses for fishing once I was old enough to buy my own. When I started windsurfing in '07, I ditched the polarized lenses as it seemed to make it harder to read the chop. For me, polarized definitely let me see through the glare on top of the water to see the fish below, but then you lose the surface contrast that helps you read the chop. After experimenting last year, I have found polarized snow goggles are bad on the snow for me, for the same reason. So no more polarized anything for me.
I wear sunglasses on the water all the time, except for prone surfing as the fog issue cannot be solved in that sport. My face fits my glasses just perfect (I have a wider face) with my glasses snug - but not overly tightly against my face. The small gap allows some air movement (clears fog if you move fast), but still stops spray. Most of the fogging issue I deal with has to do with sunscreen. When I fall in a few times, the sunscreen comes off my face and gets on the glasses. Then after about a half-hour (and falling in), I come in and wipe the sunscreen haze off the lenses. After that, I do not need
to clean them again until I reapply sunscreen. Though I will wipe again (especially in salt water) if I come in for water or to change kites.
I use exclusively Checklite "Crews" safety glasses that cost just a bit more than $1.00. They come in dark tinted and a light gold tint that is better for low light. I drill a small hole by hand, with a drill bit melted into a piece of plastic (for a handle), into the hole in the end of the ear piece where there is a cast in indent. I then put a small piece of 1/8" shock core (bungee cord) through it. The hole is tight enough to allow me to adjust the tension. But being tight, you need to fray the end of the shock cord, push that fray through, and then pull the fray with needle nose pliers to pull in the rest of the cord. Once I find a length range, I tie an overhand knot to stop it from pulling out. If you do not put the knot there, you could consider it a safety release in case they got hung up on a line. I don't worry about that as my helmet is much more of a snagging hazard than the glasses.
Here they are, and click on the "specs/details" tab for the light blocking specifications:
Low light (overcast or when it is raining) gold glasses (too dark to wear at night)
https://www.mcrsafety.com/safety-equipm ... sses/cl119
Overcast to sunny days
https://www.mcrsafety.com/safety-equipm ... sses/cl012
One of polycarbonate's issues is that it scratches easily. But given the cost of these (around $15.00 a dozen) just pitch them when they get scratched. And they are so cheap, I actually give them away to kiters I see struggling with sun glare.