srw
It's a bit more complicated than that...
@mmmmartin was sporting a fine pair of photochromic old-fashioned cheap-glasses-with-large-frames-from-a-chain-optician a couple of weekends ago, and seemed to find them OK. I've used Optilabs in the past, and am about to attempt to use contacts. If I get on with them (and can get a prescription that works) I'll be using them with plain sunglasses.