Objective To provide the pathogenic evidence for patients with visual disturbances,the origin,branches and inner diameters of the anomalous ophthalmic artery were investigated.

Using integral calculating the paper derives the integral formular of calculating the coordinate value of spiral curve arbitrary micro-length,by which can ensure contin- uous surveying of the transition curve and overcome the difficulties caused by sight obstruct.

A method was presented based on the principle of the Eyellipse for describing systematically driver s visual field and visual obstructions, discussed the measurement of the direct ambinocular view, direct binocular obstruction, indirect ambinocular view, indirect monocular or binocular obstruction and steering wheel obstruction and drew the principles of how to apply the Eyellipse in this method.