Cal. Bus. & Prof. Code § 3090

Except as otherwise provided by law, the board may take action against all persons guilty of violating this chapter or any of the regulations adopted by the board. The board shall enforce and administer this article as to licenseholders, including those who hold a retired license, a license with a retired volunteer designation, an inactive license issued pursuant to Article 9 (commencing with Section 700) of Chapter 1, or a temporary license, and the board shall have all the powers granted in this chapter for these purposes, including, but not limited to, investigating complaints from the public, other licensees, health care facilities, other licensing agencies, or any other source suggesting that an optometrist may be guilty of violating this chapter or any of the regulations adopted by the board.