 Participating subjects must be at least 55 years of age or older with age-related macular degeneration AMD. After consent, a chart review will be performed. At the baseline visit, subjects will have an electroretinogram ERG. At the single study visit, to be scheduled within 2 weeks of the baseline visit, subjects will use the DCDC app on a tablet computer to trace their visual distortions on an Amsler grid. Up to 5 subjects who meet the inclusionexclusion criteria will be enrolled. The duration of the study is a 2 hour baseline visit and a 1 hour study visit, all within 2 weeks. 