36-7-20.2. Courses of continuing education specified by board--Certification of attendance--Waiver. The length of study required by § 36-7-20.1 shall be prescribed by the Board of Examiners in Optometry but shall not exceed forty-five hours in any three consecutive calendar years. Attendance must be at a course or courses approved by the board. Attendance at any course or courses of study are to be certified by the board upon a form provided by the board and shall be submitted by each registered optometrist at the time he makes application to the board for the renewal of his license and payment of his renewal fee. In no instance may the board require a greater number of hours of study than are available at approved courses held within the state and shall be allowed to waive any or all of this requirement in case of certified illness or undue hardship.