the optic nerve transmits all visual information including brightness perception, color perception and contrast (visual acuity). it also conducts the visual impulses that are responsible for two important neurological reflexes: the light reflex and the accommodation reflex. the light reflex refers to the constriction of both pupils that occurs when light is shone into either eye. the accommodation reflex refers to the swelling of the lens of eye that occurs when one looks at a near object (for example, when reading the lens adjusts to near vision.