How is it that Karen Walker eyewear is so cool?

I've been thinking that I should invest in a pair of designer shades. I own quite a few pairs from high street boutiques, random street markets and this one shop in People's Park that sells all these retro designs.

Increasingly, however, I've been wary about how they are supposed to be bad for your eyes. Been reading too much about insufficient UV protection and how lenses that have been tinted but not actually treated to be properly anti-UV can cause harm to the eyes. So the assumption here is that designer shades will have taken maximum care in ensuring that they protect the eyes. I hope I'm right.

My eyesight is more than perfect and I would like it to remain thus.

This is not a purchase I want to rush. I want to buy something I'll love and wear for a long time. And I think I could love the bottom right pair for a long time. Shall take time to start look through the stores slowly.