How do I use the Amsler Grid?

The grid should be used with reading glasses, in good light and held at a comfortable reading distance. Both eyes are tested, one at a time. Covering one eye, the other eye is focused on the center dot, noting the location and size of any irregularities in vision - including wavy, fuzzy or gray areas, or blind spots. It is important to stay focused on the center dot and analyze the remainder of the grid using the peripheral vision. If changes occur and they persist for several days, the patient should be examined promptly.