How do you know if an online glasses store is actually trustworthy?

I really wanna buy my first pair of premium sunglasses, but where I live right now is terrible for this kind of stuff. We don't have anything close by. It's a very small town in the US, and the closest optical store or any type of independent eyewear company is hours away, so the only option is really ordering online.

But the biggest worry I have is actually finding a place that has good stuff, like good customer support and just good shipping, and obviously good quality.

I'm also a little worried about authenticity since some of the sunglasses I've been looking at are a few hundred bucks, and I really don't wanna spend that much just to end up with something fake or have a nightmare trying to return them if something goes wrong.

So how do you guys actually tell if an online glasses store is trustworthy before ordering from them? Is there anything specific you look for, or any stores you've ordered from multiple times and had a good experience with?