I've been looking in to prescription sunglasses recently.
I'd really like some sports wraparound glasses but the curved lenses can't be made prescriptive so you end up with normal sunglasses with prescription lenses in a simple frame that is inserted behind the sunglasses. So they look cool from the outside but a bit silly on the inside. You'd also be looking through 2 sets of lenses.
But the biggest drawback is that they cost £200+. £100+ for the frame and tinted lens, £40 for the insert frame and £60 for the lenses.
I was killing time in Southampton whilst Emma and the kids were in Lush, and went in to Vision Express. They have an offer at the moment where you get tinted, UV protecting lenses for £39. You pay full price for frame which range from £20 to £150+.
My prescription is -3.5 and -3.0 which meant that I couldn't get the Hackett shades I wanted as they were too curved. I found another pair, Studio 123 WEH01, that were good (not as good but they were also £20 not £60).
I needed an eye test (£25) to get a current prescription and, asking at 2:40, they had one appointment left which was at 3:10 so that was perfect. By 4-ish we were leaving the store having ordered the glasses and arranging free delivery.
The receipt shows that the lenses normally cost £82 so getting them for £39 seems like a genuinely good deal.