人在观察目标时,从眼睛到目标的射线叫做视线,眼睛所在的位置叫做视点,有公共视点的两条视线所成的角叫做视角.正常眼能区分物体上的两个点的最小视角约为1分.我们把视线不能到达的区域叫做盲区.肓区特征:①人离障碍物越近,盲区越大;②将视点与障碍物的顶点连线,交地面于一点,此点即是盲区与非肓区的分界点. People observe the target, the ray from the eye to the target is called line of sight, the location of the eye is called the point of view, the angle between the two lines of sight of the public point of view is called the angle of view of the normal eye can distinguish two points on the object minimum angle of about 1 point.We call the blind area the line of sight can not reach.?????????????????????????????????, the closer the people from the obstacle, the greater the blind area; ② the point of view and the top of the obstacle connection, pay a little at the ground, this point is The dead zone and the non-zone of the cut-off point.