# medical examiner's certificate — How long medical certificates last for pilots, commercial drivers and merchant mariners — by class, age and service type For medical examiner's certificate, occupation / regulator is commercial motor vehicle driver (FMCSA); age / service condition is Any driver who does not satisfy, with the worse eye, either the distant visual acuity standard with corrective lenses or the field of vision standard, or both; valid for is 12 months; citation is 49 CFR 391.45, recorded from its source on 2026-08-11. - **Occupation / regulator:** commercial motor vehicle driver (FMCSA) _(our reading, not quoted from the source)_ - **Certificate and class:** medical examiner's certificate _(verified: appears in the quote below)_ - **Age / service condition:** Any driver who does not satisfy, with the worse eye, either the distant visual acuity standard with corrective lenses or the field of vision standard, or both _(verified: appears in the quote below)_ - **Valid for:** 12 months _(verified: appears in the quote below)_ - **Citation:** 49 CFR 391.45 _(verified: appears in the quote below)_ ## What the source says > ( f ) Any driver who does not satisfy, with the worse eye, either the distant visual acuity standard with corrective lenses or the field of vision standard, or both, in § 391.41(b)(10)(i) and who has obtained a medical examiner's certificate under the standards in § 391.44 , if such driver's most recent medical examination and certification as qualified to drive did not occur during the preceding 12 months; ## Source - https://www.ecfr.gov/current/title-49/subtitle-B/chapter-III/subchapter-B/part-391/subpart-E/section-391.45 Last verified: 2026-08-11. Review by: 2027-08-11. Part of [How long medical certificates last for pilots, commercial drivers and merchant mariners — by class, age and service type](https://referencesource.org/medical-certificate-validity-by-occupation/).