A square-shaped grid for detecting or monitoring metamorphopsia or scotoma to detect disorders in the macula and optic nerve head. It is a design of 400 small squares consisting of white lines separated by black lines or vice versa. In the middle of the grid is a fixation dot used to detect wet age-related macular degeneration by the presence of curved, distorted or broken lines (metamorphopsia). It is a useful, inexpensive, home-monitoring tool for early detection.