Mutations in EYS are recognised as a major cause for autosomal recessive retinitis pigmentosa (arRP)4, 5, 6, 7, accounting for 5–18% arRP patients in different populations4, 8, 9, and have also been identified in patients with autosomal recessive cone-rod dystrophy (arCRD)10, 11. This evidence concerns the gene EYS and autosomal recessive retinitis pigmentosa.