Grid lines add horizontal and/or vertical lines to your graph that aid in measuring graph values. By default, these grid lines use the color assigned to the "automatic" selection feature, which is ...

An Amsler grid, also known as an Amsler grid test, is a tool you can use at home to test your eyes for vision problems. It’s commonly used to test for signs of age-related macular degeneration (AMD).

I read with interest the paper by FH Zaidi and colleagues titled ‘The Amsler chart is of doubtful value in retinal screening for early laser therapy of subretinal membranes’ (Eye 2004; 18: 503–508).