Any person who has successfully passed a standard examination in optometry in any state of the United States or all parts of the examination given by the National Board of Examiners in Optometry and is the holder of a certificate to that effect, issued by the board of that state, or by the national board, and who has a current license to practice optometry in any state in the United States, and has conducted an ethical professional practice of optometry for at least one year, may, at the discretion of the board, and upon the payment of the amount of the regular examination fee, take the standard examination, and upon passing the examination be registered as qualified to practice optometry in this state. Optometrists licensed under this chapter may apply to the board for approval to use pharmaceutical agents for the treatment of disease of the human eye and its adjacent structures. The board shall prescribe rules and regulations setting forth the manner in which the application shall be made and approval shall be given. Licensed pharmacists of this state shall fill those prescriptions as are ordered by licensed optometrists approved by the board to use pharmaceutical agents.