“…10 Flu vaccination has also been reported to be associated with numerous ophthalmic adverse effects; in addition to uveitis, 10 multiple evanescent white dot syndrome 14 and a variety of types of inflammation involving the optic nerve, including optic nerve head inflammation, 15 retrobulbar optic nerve inflammation, 16 and acute macular neuroretinopathy 17 have been documented. Optic neuritis has also been reported to be associated with administration of the tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis (Tdap)-inactivated polio vaccine, 18 hepatitis A virus (HAV) vaccine and typhoid fever vaccine, 19 measles vaccine, 20 anti-rabies vaccine, 21 , 22 Tdap vaccine, 23 and varicella-zoster virus vaccine. 24 Although the exact mechanism is unknown, vaccine-induced optic neuritis is believed to occur because the T-cells activated by vaccines cross the blood-brain barrier, resulting in type IV hypersensitivity.…”