Why does the price of laser eye treatment vary so much?

Why does the price of laser eye treatment vary so much? You know the feeling. You browse the shops on a Saturday afternoon and come across what you believe is an absolute bargain — a steal in fact. Hoping the assistant doesn’t realise the blatant mistake on the price tag, you approach the counter all inconspicuously and get out your money to pay. To your great surprise and delight, they don’t say a word. You rush home to try out…