A system and method for assessing vision and tracking changes in vision is provided. A shape is presented on a display to a user who experiences partial or complete vision loss in the central or paracentral region of the visual field. The user manipulates the dimensions of the shape to correspond to a region of vision loss, and a metric is calculated to indicate the spatial extent of the region of vision loss. Metrics from previous assessments can be compared to track progression of visual impairment.
