A basic yet important tool for monitoring your vision is called an amsler grid. You can use it at home to detect changes in your central or macular field of vision. You simply sit in a well lit area and hold the grid away from you in a comfortable position. If you wear glasses you should keep them on. Cover one eye and look directly at the center of the grid but observe the patterns vertical and horizontal lines in your peripheral vision. Then do the same with the other eye. Typically and visual abnormality due to AMD would cause the straight lines to appear wavy or blurry or areas to appear dark or even blank. If you notice any changes in the grid you should contact your opthamologist immediately.