The doctor will use the Amsler grid to detect macular degeneration. This tool can be used to detect vision problems which caused by the damage to the macula or the optic nerve. Macular degeneration, glaucoma or other eye diseases can cause damage to the macula or the optic nerve. So the doctor usually use Amsler grid to detect whether there is macular degeneration in your eye.
During an eye exam, the doctor may use the Amsler grid to detect any problems about macular degeneration in the center of your vision. The Amsler Grid can help you detect it early. If you have macular degeneration, you may get wavy, broken or distorted lines or a blurred or missing area of vision.
Your doctor may use several methods to test you for AMD:
A vision field test.
Testing with an Amsler grid, which involves covering one eye and staring at a black dot in the center of a checkerboard-like grid. If the straight lines in the pattern look wavy or some of the lines seem to be missing, these may be signs of macular degeneration.
Fluorescein angiography, where a special dye is injected into a vein in your arm and pictures are taken as the dye passes through the blood vessels in the retina.
Optical coherence tomography (OCT), an imaging test that can look for areas where the retina may be thin or where there may be fluid under the retina.