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If you are at risk for these problems, you can test your vision at home with these tests: Amsler Grid. Near Vision Chart.

If you have macular degeneration, the lines may appear wavy or curved, or you may see a blank or dark area in the middle of the grid. In the second grid, the lines around the centre are wavy and distorted. This is one example of how the straight lines in the grid above might appear to someone with macular degeneration.

The Amsler grid is a simple square containing a grid pattern and a dot in the middle. This design, when used correctly, can show problem spots in your field of vision. For someone with AMD, an Amsler grid may appear to have wavy lines or blank spots.

Instructions for using the Amsler Grid Hold the grid at a comfortable reading distance (generally, about 12-14 inches away). Wear your reading glasses if you normally use them. Cover one eye and focus on the black dot in the middle of the grid. Cover the other eye and repeat the test.

Amsler Grid Any changes that occur in the center of your field of vision may cause the lines in the grid to disappear or seem wavy and may be a sign that macular degeneration is progressing.

Examples of abnormal findings on the Amsler Grid: Macropsia - caused when photoreceptors are forced closer together. Micropsia - caused when photoreceptors are forced farther apart. Metamorphopsia- caused by a combination of squeezing and spreading of photoreceptors.

With their reading glasses on, patients should be asked to cover one eye and concentrate on the central dot on the grid. If all lines are visible without distortion and all boxes are observed to be present, then the testing result is considered to be normal and the fellow eye is tested.