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.
From Creativity - Beyond the Myth of Genius, by Robert W. Weisberg. ...creative refers to novel products of value, as in The airplane was a creative invention. Creative also refers to the person who produces the work, as in, ?Picasso was creative.