§391.41 PHYSICAL QUALIFICATIONS FOR DRIVERS
(a)(1) (i) A person subject to this part must not operate a commercial motor vehicle unless he or she is medically certified as physically qualified to do so, and, except as provided in paragraph (a)(2) of this section, when on-duty has on his or her person the original, or a copy, of a current medical examiner’s certificate that he or she is physically qualified to drive a commercial motor vehicle.
(ii) A person who qualifies for the medical examiner’s certificate by virtue of having obtained a medical variance from FMCSA, in the form of an exemption letter or a skill performance evaluation certificate must have on his or her person a copy of the variance documentation when on-duty.
(2) CDL exception. (i) Beginning January 30,2014, a driver required to have a commercial driver’s license under part 383 of this chapter, and who submitted a current medical examiner’s certificate to the State in accordance with § 383.71(h) of this chapter documenting that he or she meets the physical qualification requirements of this part, no longer needs to carry on his or her person the medical examiner’s certificate specified at §391.43(h), or a copy for more than 15 days after the date it was issued as valid proof of medical certification.
(ii) A CDL holder required by §383.71(h) to obtain a medical examiner’s certificate, who obtained such by virtue of having obtained a medical variance from FMCSA, must continue to have in his or her possession the original or copy of that medical variance documentation at all times when on-duty.
(3) A person is physically qualified to drive a commercial motor vehicle if:
(i) That person meets the physical qualification standards in paragraph (b) of this section and has complied with the medical examination requirements in §391.43; or
(ii) That person obtained from FMCSA a medical variance from the physical qualification standards in paragraph (b) of this section and has complied with the medical examination requirement in §391.43.
(b) A person is physically qualified to drive a motor vehicle if that person:
(1) Has no loss of a foot, a leg, a hand, or an arm, or has been granted a Skill Performance Evaluation (SPE) Certificate (formerly Limb Waiver Program) pursuant to §391.49.
(2) Has no impairment of: (i) A hand or finger whichinterfereswithprehensionorpowergrasping; or (ii) An arm, foot, or leg which interferes with the ability to perform normal tasks associated with operating a commercial motor vehicle;or any other significant limb defect or limitation which interferes with the ability to perform normal tasks associated with operating a commercial motor vehicle; or has been granted a SPE certificate pursuant to §391.49.
(3) Has no established medical history or clinical diagnosis of diabetes mellitus currently requiring insulin for control.
(4) Has no current clinical diagnosis of myocardial infarction, angina pectoris, coronary insufficiency, thrombosis, or any other cardiovascular disease of a variety known to be accompanied by syncope, dyspnea, collapse, or congestive cardiac failure.
(5) Has no established medical history or clinical diagnosis of a respiratory dysfunction likely to interfere with his ability to control and drive a commercial motor vehicle safely.
(6) Has no current clinical diagnosis of high blood pressure likely to interfere with his ability to operate a commercial motor vehicle safely.
(7) Has no established medical history or clinicaldiagnosisofrheumatic,arthritic,orthopedic, muscular, neuromuscular, or vascular disease which interferes with his ability to control and operate a commercial motor vehicle safely.
(8) Has no established medical history or clinicaldiagnosisofepilepsyoranyothercondition whichislikelytocauselossofconsciousnessorany lossofabilitytocontrolacommercialmotorvehicle.
(9) Has no mental, nervous, organic, or functional disease or psychiatric disorder likely to interfere with his ability to drive a commercial motor vehicle safely.
(10) Has distant visual acuity of at least 20/40 (Snellen) in each eye without corrective lenses or visual acuity separately corrected to 20/40 (Snellen)or better with corrective lenses, distinct binocular acuity of at least 20/40 (Snellen) in both eyes with or without corrective lenses, field of vision of at least 70 degrees in the horizontal meridian in each eye, and the ability to recognize the colors of traffic signals and devices showing standard red, green and amber.
(11) First perceives a forced whispered voice in the better ear at not less than 5 feet with or without the use of a hearing aid, or, if tested by use of an audiometric device, does not have an average hearing loss in the better ear greater than 40 decibels at 500 Hz, 1,000 Hz and 2,000 Hz
with or without a hearing aid when the audiometric deviceiscalibratedtoAmericanNationalStandard
(formerly ASA Standard) Z24.5-1951.
(12) (i)Doesnotuseanydrugorsubstance identified in 21 CFR 1308.11 Schedule I, an amphetamine, a narcotic, or any other habit- forming drug.(ii) Does not use any non-Schedule I drug or substance that is identified in the other Schedules in 21 part 1308 except when the use is prescribed by a licensed medical practitioner, as defined in § 382.107, who is familiar with driver’s medical history and has advised the driver that the substance will not adversely affect the driver’s ability to safely operate a commercial motor vehicle.
(13) Has no current clinical diagnosis of alcoholism.
Reference from: http://apps.dmv.ca.gov/forms/dl/dl51.pdf