Originally Posted by
Bren
Mostly? Marketing. The marketing budgets of national brands like Oakley es grande. Somebody's gotta pay for those full-page ads.
To be fair, sometimes there are actual innovations behind the marketing. And often those innovations will cost you more money. But by and large, you're paying for a brand.
Not completely marketing. There are differences in lens material and their UV absorption ability. If you need Rx inserts, the $20 ones aren't going to offer any help there.