Grid Health Dictionary

a chart usually consisting of a grid of black lines on a white background. It is used to detect and monitor problems of central vision affecting the retina; for example, in early macular disease, the square edges of the grid may appear distorted. [M. Amsler (1891–1968), Swiss ophthalmologist]... amsler grid

an oblique incision made in the right lower quadrant of the abdomen, classically used for *appendicectomy.... gridiron incision