Examinations shall be administered by the National Board of Examiners in Optometry (NBEO) at least once a year with additional examinations as the National Board of Examiners in Optometry deems necessary. The time and place of the examinations shall be determined by the National Board of Examiners in Optometry. If any of the examinations administered by the National Board of Examiners in Optometry are no longer considered appropriate by the board or any of the examinations are no longer administered by the National Board of Examiners in Optometry, the examination shall be administered by the board or a testing agency designated by the board.