Sec. 351.359. PRESCRIPTION. (a) An ophthalmic lens prescription must include: (1) the signature of the optometrist or therapeutic optometrist; and (2) the information and parameters the optometrist or therapeutic optometrist considers relevant or necessary. (b) The prescription may not contain a restriction that limits the parameters to a private label not available to the optical industry as a whole. Acts 1999, 76th Leg., ch. 388, Sec. 1, eff. Sept. 1, 1999.