DOT physicals are performed by doctors who have received special training to identify health conditions related to the workplace. They also have a sound understanding of the regulations put forth by the Department of Transportation. During the exam, one of the doctors will examine your vision and hearing. Drivers with vision or hearing issues should also bring their eyeglasses, contacts or hearing aids to the exam. This will ensure that the doctor is able to give accurate results. ​A driver must have 20/40 distant visual acuity in each eye, with or without corrective lenses, to pass a DOT vision test. They must also be able to recognize the standard traffic signal colors of red, green and amber. Similarly, you may also undergo hearing tests including a whisper test and other assessments. The examiner will stand about five feet away from you and will whisper random numbers. You’ll then need to repeat them back.