A Central Vision Test is a simple screening test used to assess the macula (the center of the retina). The Amsler Grid, which tests the central vision, consists of evenly spaced horizontal and vertical lines printed on black or white paper with a small dot in the center of the grid for fixation. The presence of wavy lines and missing areas of the grid is helpful for determining vision problems.
If the lines of grid do not appear straight and parallel or there are missing areas, the doctor will examine the back of the eye (the macula) very closely. This test is frequently given to patients to monitor macular degeneration.