The tissue damage in individual hypersensitivity reactions is often caused by a mixture of the types of hypersensitivity reaction, for example, a combination of types I and IVa. IVb and IVc in contact hypersensitivity.
Depending on its location and severity, a TBI can affect your vision by damaging parts of the brain involved in visual processing and/or perception (e.g., cranial nerves, optic nerve tract or other circuitry involved in vision, occipital lobe).
The Eye. Vision begins at the eye, where light rays are focused onto light-sensitive elements at the back of the eye. The main parts of the eye are: The cornea -- the transparent front of the eyeball. The cornea acts as a lens and in fact is responsible for most of the bending of the light rays needed to focus an image at the back of the eye.