215 ILCS 161/15

Fees paid under a vision care plan for covered services and covered materials, regardless of the supplier or optical lab used to obtain materials, shall be reasonable and shall be clearly listed on a fee schedule that has been provided to the eye care provider before entering into a contract with the vision care organization. Fees paid for materials supplied by a non-network lab are not required to be identical to fees paid for materials ordered through a network lab, but non-network lab fees shall be reasonable.