California Code, Revenue and Taxation Code - RTC § 6018

(a) In the case of a licensed optometrist or physician and surgeon with respect to the ophthalmic materials used or furnished by him or her, in the performance of his or her professional services in the diagnosis, treatment or correction of conditions of the human eye, including the adaptation of lenses or frames for the aid thereof.

(b) In the case of a licensed pharmacist only with respect to replacement contact lenses dispensed pursuant to Section 4124 of the Business and Professions Code.

(c) In the case of a registered dispensing optician with respect to the dispensing of ophthalmic materials.