1. The Department of Clinical Genetics Helsinki University Hospital, HUSLAB Helsinki Finland
2. Norio Centre Rinnekoti Foundation Helsinki Finland
3. The Department of Ophthalmology Helsinki University Hospital Helsinki Finland
4. St Mary′s Hospital Central Manchester University Hospitals and Manchester Centre for Genomic Medicine Manchester UK
5. Visio Low Vision Research Centre Finnish Federation of the Visually Impaired Helsinki Finland
6. Finnish Register of Visual Impairment by National Institute for Health and Welfare Helsinki Finland