The use of a uniform pattern for perimetry at the center of the visual field enables scotomas boundaries to be reproduced with almost complete authenticity, and small, isolated losses to be determined. As is the case with several automatic perimeters, the pattern principle can be used manually with the Goldmann projection perimeter; it is only necessary to modify the visual field scheme. The uniform pattern also permits the extent of central visual field loss to be expressed by means of a quotient which is simple to calculate.