225 ILCS 80/6
Every holder of a license under this Act shall display such license on a conspicuous place in the office or offices wherein such holder practices optometry and every holder shall, whenever requested, exhibit such license to any representative of the Department, and shall notify the Department of the address or addresses and of every change thereof, where such holder shall practice optometry.
Every licensed optometrist shall keep a record of examinations made and prescriptions issued, which record shall include the names of persons examined and for whom prescriptions were prepared, and shall be signed by the licensed optometrist and shall be retained in the office in which such professional service was rendered or in a secure offsite storage facility. Such records shall be preserved by the optometrist for a period designated by the Department. A copy of such records shall be provided, upon written request, to the person examined, or his or her designee.
225 ILCS 80/6