For the price of an examination and ONE pair of glasses here, I can fly to Mexico, stay in a hotel for a week, and get two sets of glasses and frames.
I then come home and still have $250 or so left over.
Or I can get two pairs of glasses from a discount lab in China (pre-tariff) for $69 without ever leaving my chair (and I do). Unfortunately, I do have to leave my chair for the Costco Optometric exam, $89.