Just because your optometrist or ophthalmologist does your eye exam doesn’t mean you have to buy your eyeglasses from him or her. By law, your physician is required to give you your prescription so you can comparison shop for eyewear. You may find a better deal at online stores, wholesale clubs and other discount retailers. If you go this route, stick to companies you know, and make sure there’s a protocol in place should there be a problem with your order. Also, steer clear of any company that says you don’t need a prescription.