D.C. Mun. Regs. tit. 24, r. 24-2310
To establish age as required by § 203(a)(1) of the Act, a valid driver's license, birth certificate, or other government document requiring a date of birth under penalty of perjury shall be acceptable.
A valid driver's license from any state, territory, or possession, or an international driver's license or one issued by the military shall, in the case of a new resident, be treated the same as if it had been issued by the District.
When a District permit is obtained, the applicant shall communicate the permit number to the Firearms Registration Section.
To establish that the applicant complies with the vision requirements of § 203(a)(11) of the Act, the applicant shall certify in writing, on a form provided by the Firearms Registration Section, that the applicant's vision is not impaired more than 20/200 visual acuity in the better eye and for whom vision cannot be improved to better than 20/200, or who has loss of vision due wholly or in part to impairment of field of vision or to other factors which affect the usefulness of vision to a like degree.
If the Firearms Registration Section determines there are reasonable grounds to believe that the certification provided in § 2310.4 is not accurate, the Firearms Registration Section may require the applicant to obtain a certification from a licensed optometrist that the applicant meets the vision requirement of § 203(a)(11) of the Act.
D.C. Mun. Regs. tit. 24, r. 24-2310