Section 351.301 - Renewal Certificate(a) A person required by this subchapter to hold a renewal certificate may not practice optometry or therapeutic optometry without the certificate.(b) A violation of this section has the same effect as, and is subject to the penalties for, practicing optometry or therapeutic optometry without holding a license as required by Subchapter F.Amended by Acts 2017, Texas Acts of the 85th Leg. - Regular Session, ch. 385,Sec. 11, eff. 9/1/2017.Amended by Acts 2017, Texas Acts of the 85th Leg. - Regular Session, ch. 385,Sec. 10, eff. 9/1/2017. Acts 1999, 76th Leg., ch. 388, Sec. 1, eff. 9/1/1999.