Deaf-blindness is a complex disability caused by a combination of hearing and vision loss. There are several potential causes including genetic conditions like Usher Syndrome. The impact on individuals varies depending on factors like age of onset and severity of sensory loss. Assistive technologies and interventions like sign language, Braille, and mobility aids can help deaf-blind people communicate and navigate the world. Organizations like Helen Keller National Center aim to support deaf-blind individuals and enable them to live independently through dedicated assistance and accommodations.