I know there are a few deals on here for Speckyfoureyes but I couldn't see this one so apologies if posted elsewhere.
Speckyfoureyes have a sale on Superdry glasses and shades.
Get a pair of prescription glasses for £15 or a pair of sunglasses for £25, delivery costs £4,99 for either.
Use code SUPERHOTDEAL in the basket before completing your order to get the discount.
The Ted Baker offer posted on here a while back is also still working! (glasses for £30/ sunglasses £40 using code LOVETED)