Stay clear of the shop in Patio Bullrich, 1st Floor.
They dissapointed me big time. Extremely nice but ineffective. My prescrition was fine but i told them to be particularly consciuos of sweet spot where my eyes look through so i wouldn't end up with a dozen ghost light reflections at night (past experience) anf they screwed just like they were never warned. The lady measured my eyes just by looking at me. Royal screwup.
My regular place is Ker, accross Av. Rivadavia from the Village Caballito. They have my file and don't screw around. Just had to add 4 cab trips to the bill.
Patio B is walking distance from home.