California Business And Professions Code Section 2553
If the board, after investigation, approves the application, it shall register the applicant and issue to the applicant a certificate of dispensing optician. A separate certificate of registration shall be required for each address where the business is to be conducted. A certificate authorizes the applicant, its agents and employees acting therefor to engage in the business defined in Section 2550 provided that the fitting and adjusting of spectacle lenses is performed in compliance with Article 1.5 (commencing with Section 2559.1) and the fitting and adjusting of contact lenses is performed in compliance with Article 2 (commencing with Section 2560). Each certificate shall be at all times displayed in a conspicuous place at the certified place of business. The certificate shall not be transferable, but on application to the division there may be registered a change of address of the certificate. This section shall become operative on January 1, 1988.