1 *Department of Ophthalmology, Leiden University Medical Center, Leiden, the Netherlands †The Rotterdam Eye Hospital, Rotterdam, the Netherlands ‡Department of Ophthalmology, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands §Department of Clinical and Molecular Ophthalmogenetics, Netherlands Institute for Neuroscience, Royal Netherlands Academy of Arts and Sciences, Amsterdam, the Netherlands ¶Department of Ophthalmology, Academic Medical Centre, Amsterdam, the Netherlands **Bartiméus Institute for the Visually Impaired, Zeist, the Netherlands.