Well, generally speaking, optic neuritis is known as retro-bulbar neuritis and it is a leading cause of vision loss. In common, it can be caused by a variety of processes leading to inflammation and damage to the optic nerve. So in my opinion, you may need to go and see the ophthalmologists who will be specialists, though both optometrists and ophthalmologists can be eye doctors. And actually optic neuritis is related to damage to the optic nerve as a result of increased pressure within the eye. By the way, smoking can just increase the risk of getting optic neuritis. And also, injury to the optic nerve caused by trauma can be the cause too. So just be careful about it.