Cal. Bus. & Prof. Code § 2566.2

Every registration issued to a dispensing ophthalmic business, contact lens dispenser, and spectacle lens dispenser shall expire 24 months after the initial date of issuance or renewal. To renew an unexpired registration, the registrant shall, before the time at which the license would otherwise expire, apply for renewal on a form prescribed by the board, and pay the renewal fee prescribed by this chapter.