S.D. Codified Laws § 47-11B-1

One or more optometrists may form professional service corporations for the practice of optometry under the South Dakota Business Corporation Act, as amended, providing that such corporations are organized and operated in accordance with the provisions of this chapter. Optometrists may form a limited liability company for the practice of optometry under the South Dakota Limited Liability Company Act, as amended, providing that such limited liability companies are organized and operated in accordance with the provisions of this chapter.