California Code, Business and Professions Code - BPC § 3502

(1) The PA renders the services under the supervision of a licensed physician and surgeon who is not subject to a disciplinary condition imposed by the Medical Board of California or by the Osteopathic Medical Board of California prohibiting that supervision or prohibiting the employment of a physician assistant.

(2) The PA renders the services pursuant to a practice agreement that meets the requirements of Section 3502.3.

(3) The PA is competent to perform the services.

(4) The PA's education, training, and experience have prepared the PA to render the services.

(b)(1) Notwithstanding any other law, a physician assistant performing medical services under the supervision of a physician and surgeon may assist a doctor of podiatric medicine who is a partner, shareholder, or employee in the same medical group as the supervising physician and surgeon.  A physician assistant who assists a doctor of podiatric medicine pursuant to this subdivision shall do so only according to patient-specific orders from a supervising physician and surgeon.

(2) A supervising physician and surgeon shall be available to the physician assistant for consultation when assistance is rendered pursuant to this subdivision.  A physician assistant assisting a doctor of podiatric medicine shall be limited to performing those duties included within the scope of practice of a doctor of podiatric medicine.

(1) The determination of the refractive states of the human eye, or the fitting or adaptation of lenses or frames for the aid thereof.

(2) The prescribing or directing the use of, or using, any optical device in connection with ocular exercises, visual training, or orthoptics.

(3) The prescribing of contact lenses for, or the fitting or adaptation of contact lenses to, the human eye.

(4) The practice of dentistry or dental hygiene or the work of a dental auxiliary as defined in Chapter 4 (commencing with Section 1600).