How can I get contact lenses with the prescription my opthamologist gave me?

I've worn contact lenses for a few years. For my most recent check-up, I switched to an opthamologist who does not work with an optician. The opthamologist says that the prescription he gave me can get me contact lenses (as well as glasses), but he did not explain how. With my old optometrist, he'd examine my eyes, have me try a pair of contacts and then I'd order them in his office.|||Go back to other office and give them your prescription to buy contact or buy online