On the Internet to watch the video of the traffic accident, its various forms of tragic state I will not say, of course, is unbearable, unbearable to look back. The process of retrospection, analysis of the causes, is the driver medical examination doctor should pay attention to things. From the driver’s side to understand the cause of the occurrence should have mental problems,, first of all, there are perceptual disorders, common mental symptoms include perceptual disorders, “perception includes sensory and perceptual two parts. Sensation is the brain’s reflection of the individual properties of objective things that act directly on the sense organs, such as light, sound, color, smell, cold, heat, soft and hard, etc., through the sense organs miscellaneous love the direct reflection of the human brain. Perception is a complete impression formed by the synthesis of various properties of objective things in the human brain and with the help of past experience. Vision, hearing, taste, smell, touch, balance, kinesthesia, etc. are all different types of senses that reflect the individual properties of things, and perception is generated on the basis of the synthesis of these senses.” Obviously, the collision is related to the visual-auditory and balance senses of both perpetrators. Understanding from the visual physiology, people’s vision has light perception, color perception, picture recognition, spatial perception, regulation, collection and reflexes of the eye, etc. …… The overall structure of the human heart nervous system constitutes a support for vision. But in the driver’s physical examination form items, only the central vision and color vision examination, the driver’s heart disease, neurological disorders and psychiatric content is all by the subject’s own statement, many important indicators in a short period of time is difficult to detect, these aspects of the lack of objective examination items, the motor system problems are obvious, look at the general situation can be seen at a glance. Driver physical examination has central vision and color vision examination, central vision is the ability to distinguish light, is the function of the gaze around the point within 3 degrees, check the color blindness with the picture recognition. Visual examination with corrected visual acuity and no color blindness alone is not enough, there is no bright adaptation and dark adaptation, and poor dark adaptation is night blindness. Visual field can reflect the complete information of the eye and visual conduction pathway, including information about diseases that affect color vision, including information about diseases that affect bright adaptation and dark adaptation, visual field defects affect the driver’s observation of the road when looking ahead, traffic regulations say that color blindness can not drive, there is no saying that color weakness can drive, color blindness and color weakness are color vision abnormalities, the so-called color weakness can drive without the text of the regulations, can not see the dark light traffic lights It is also a problem. The complete visual field function of both eyes constitutes simultaneous vision of both eyes. ”Binocular vision is clinically classified into 3 levels: simultaneous vision, fusion vision and stereopsis”, “definition of simultaneous vision – the ability of both eyes to see two images of different pictures at the same time and be synthesized by the brain into one object is called simultaneous vision”. ”Definition of fusion vision-The ability of both eyes to see images that are partly the same and partly different as one image is called fusion.” When the driver looks forward, the driver’s binocular field of vision mostly overlaps, and the composition of the overlapping field of vision is fused, but the area of overlapping binocular field of vision when gazing to the side is smaller, then the visual field deficit of the non-overlapping part affects the perception of road conditions. ”Stereopsis is an advanced binocular monocular function, formed on the basis of simultaneous vision and fusion function of the independent binocular vision level one vision function also includes the complete visual field, including the optical field and color vision energy, is the depth perception of three-dimensional space. Since the two human eyes are about 60 mm apart, when observing a three-dimensional target, the two eyes are observed from different angles, with the left eye seeing more of the left part of the target and the right eye seeing more of the right part, so that there are certain differences between the object images on the retina of the left and right eyes, resulting in visual differences between the two eyes, i.e., binocular parallax, and visual stimuli in non-corresponding parts of the retina of both eyes, in the form of neural excitation The visual stimulus of the non-corresponding part of the retina of both eyes is transmitted to the cerebral cortex in the form of neural excitation, which produces stereo vision …… “When a driver drives, he needs to judge the distance between the car and the object in front of him, and stereo vision requires normal position of both eyes, then, even if the patient with strabismus has normal vision in one eye, there is no spatial perception, and the driver cannot judge the distance between the car he drives and the car in front It is also quite dangerous. When the medical examiner sees the disease affecting vision, even if the central vision and color vision is normal also has the right to state the risk factors factually, the driver’s physical examination should include a health examination is engaged in accordance with the law. When the optic papillary depression increases, that is, when C / D = > 0.7, is with the objective signs of chronic glaucoma, at this time, if the visual field examination is not seen abnormal is inaccurate visual field examination, is the examiner will not check and the subject is not fixed, is in the examination of the visual marker in the blind spot parts of the subject’s subconscious eye occurred to follow the action. When the driver’s attention is focused on the front of the eye does not move, but also do not realize that the small blind spot parts can not see the road, so chronic glaucoma driving is very dangerous, glaucoma belongs to the ischemic cerebrovascular disease, so the law is also not to drive.