It is free to join Nota. To be registered, one must have a documented visual impairment or reading disability. Nota members' reading disabilities are typically
dyslexia and visual impairment, but there are also members with cognitive disabilities and physical disabilities. Nota's dyslexic users are typically enrolled by a reading tutor or reading consultant, while blind users are enrolled by vision consultants or
ophthalmologists. The third user group is people with other disabilities. Often they are registered by their general practitioner or a specialist. In addition, educators of Nota members – for example, primary school teachers – can access Nota materials in the context of teaching Nota members. Relatives, librarians or others who help Nota users to order and download books can join Nota as assistants and thus have access to order books on behalf of the member. == Studies on reading difficulties ==