What is the Amsler Grid Test?

The Amsler grid is a basic visual field test that opticians use to detect vision problems resulting from damage to the macula (the central part of the retina) or the optic nerve. This tool is named after Marc Amsler, who lived from 1891 to 1968. He was a Swiss ophthalmologist, or eye doctor, who first described the tool in 1947. This grid is a pattern that resembles a checkerboard. When your vision is normal, you should be able to see all areas on the grid, and all lines should appear straight.