R.I. Gen. Laws § 5-35.1-6: Issuance, registration, and display of certificate of license to practice optometry.

Every applicant who complies with the provisions of this chapter shall receive from the director under his or her seal a certificate of license entitling him or her to practice optometry in this state. Every person to whom a certificate of license is issued by the department shall keep that certificate displayed in a conspicuous place in the office or place of business where that person practices optometry and, whenever required, shall exhibit the certificate to any authorized representative of the department.