I signed a contract with an optometrist that states I will pay him for the services that he renders to me. The contract states that the minimum consultation fee is $112, and other exams are an extra fee. The doctor performed other exams on me however he did not provide a description of services or a cost breakdown prior to the services being rendered. We are now in a dispute over the charges and he is claiming that I signed his contract stating I will pay him whatever he decides to charge me. Is this a legal contract.