No provision of this act shall prohibit the use of a discount card by a patient or client of a vision care provider if:
(a) Enrollment by the vision care provider is:
(1) Completely voluntary; and
(2) not conditioned upon the vision care provider's participation in any other discount card with different provider terms and conditions or insurance program; and
(b) the discount card program does not make or include any coverage or payment to the vision care provider.