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).
Imagination, also called the faculty of imagining, is the ability to form new images and sensations in the mind that are not perceived through senses such as sight, hearing, or other senses.
Creativity is an attempt to discover hidden likeness in the universe. It is a search for recognition and order. Many writers and artists have described creativity as something external to the body. They believe that the source of inspiration exists outside the person. Author Joseph Heller describes his own experience. I don't understand the process of imagination though I know that I am very much at its mercy.