Funny you should mention this…. Just picked up my first glasses ever. Quite the revelation!
Mine are from Specsavers, they seem fine: quick prescription and a decent range. MissStripes got hers there too and has for several years.
Only drawback was the whacky pricing: BOGOF, but you don’t want non coated lenses, so that was an extra €60 straight away. Seeing (lol) as they’re my first pair, I choose to buy one pair and get 20% off, rather than two pairs with no real clarity (ell-oh-ell) of vision (IGMC) concerning the style that would suit me.
I did ask a friend who works in the industry about lenses, and he said the thin lenses have more chromatic aberration, if that bothers you.