A grid consisting of perpendicularly crossed white stripes on a black background. The observer sees a dark shadow at the intersections of the white stripes. This phenomenon is due to lateral inhibition and does not occur for the fixated point (Fig. H2). Syn. Hermann's grid; Hermann's visual illusion.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann