The Amsler Grid is often used to monitor diseases affecting the retina, especially macular degeneration. Any abnormal area in the grid, or any change in its appearance should be checked with an eye examination on an urgent basis.

This Grid is used to detect vision problems which cause distortion or blind spots at or near the center of your vision.

Instructions
To use it, cover one eye and stare directly at the dot. Note whether there are any areas where the lines don't look straight or where there are lines that are difficult to see easily. Repeat the test with your other eye.

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Eighty percent of what we learn before age 12, we learn through our visual system.