1. WHO (World Health Organisation). Visual impairment and blindness. Geneva: WHO; 2015.
2. NHS (National Health Service). Blindness and vision loss. London: Department of Health and Social Care; 2021.
3. RNIB (Royal National Institute for the Blind). Key information and statistics on sight loss in the UK. London: RNIB; 2018.
4. CDC (Centre for Disease Control and Prevention). Vision health initiative. Atlanta GA: CDC; 2020.
5. Gathering the users’ needs in the development of assistive technology: A blind navigation system use case;Paredes;Universal Access in Human-computer Interaction: Applications and Services for Quality of Life, Lecture Notes in Computer Science,2013