Amends GS 58-50-290 to prohibit an agreement between an insurer or an entity that writes stand alone vision insurance and an optometrist for providing vision services on a preferred or in-network basis to plan members in connection with coverage under a stand-alone vision plan, but not in connection with coverage under a medical or health insurance plan, from requiring that an optometrist provide services and materials at a fee limited or set by the plan or insurer, unless the services are reimbursed as covered under the contract. Defines "materials"for the purposes of the statute. Applies to contracts entered into, amended, or renewed on or after October 1, 2013.