The Amsler grid was originally developed by Marc Amsler to allow patients to test their own central vision for early signs of macular degeneration, so it may be treated sooner. This test consists of a grid of vertical and horizontal lines.
If you note any changes in how you see the grid, call your eye doctor for evaluation.
We recommend you keep the grid where you can use it 2-3 times a week.
Amsler Grid: Test Your Eyesight