AIDS sense of SMELL. That is the main nerve responsible for odour. Damage to the nerve can CAUSE ODOR and taste distortion.The optic nerve is the agent of vision. This transmits visual information from eyes to the brain and vice versa. Any damage to this nerve results in problems related to sight and vision.Trochlear nerve also helps in eye movement. Damage to the Trochlear nerve might cause inability to move eyeball downwards and damage to the abducens nerve might result in diplopia.