AIM: To investigate the effect of neuropathic factor( NGF) on visual acuity and visual evoked potential( VEP)in patients with optic nerve contusion.METHODS: Totally 78 patients( 78 eyes) with optic nerve contusion were selected. From January 2013 to June 2016,39 cases( 39 eyes) were divided into observation group and control group respectively according to the random number table method. Prednisone,vitamins and mecobalamin tablets treatment were given to both groups,based on that,the observation group was g...