What’s the difference in appearance between expensive and cheap sunglasses

My ray bans broke not too long ago and I always thought that glasses that expensive were unnecessary so I replaced them with a cheap pair of Walmart wayfarers.

I had them on the other day and my friend immediately noticed, laughed and said what’s with the throwaway sunglasses?

She wasn’t serious or anything but I am genuinely curious as to how she could immediately peg them as cheap shades because I’m at a loss.

To me they are both pieces of plastic shaped the same way and practically indistinguishable.

What are the giveaways?
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