The normal visual field and the maps produced by different types of perimetry. (A) Three dimensional model of the right eye’s “island of vision surrounded by a sea of blindness.” The horizontal plane indicates degrees (circles) of eccentricity and meridians. The vertical axis is plotted in decibels of visual sensitivity. (B) Topography of the visual field represented by plotting isopters on polar coordinates using kinetic perimetry. (C) Grayscale rendering computed by automated perimetry.