Participants were recruited through the vision impairment charities RNIB or Vision Support to take part in the trials and had varying levels of visual impairments.
Cafodd y cyfranogwyr eu recriwtio i gymryd rhan yn y treialon drwy elusennau amhariad ar y golwg – RNIB neu Vision Support – ac roedd lefel yr amhariad ar eu golwg yn amrywio.