Okla. Stat. tit. 59 § 945
No department, commission, board, official, employee, or agency of the State of Oklahoma, or of any county, municipality or other subdivision of the State of Oklahoma shall, in the performance of its duties and functions in obtaining examination for refractions and visual training or correction for citizens of this state discriminate between persons licensed to perform examination for refraction and visual training or correction within the field for which their respective license entitle them to practice; and no such department, commission, board, official or agency of the state, county, municipality, or other subdivision shall send any resident of the State of Oklahoma out of this state to receive or be furnished such services. This section shall have no application with respect to any person confined in the Oklahoma Medical Center.
Okla. Stat. tit. 59, § 945