does not vary more than 1 % over the whole surface. Stimulus: The
luminance of the stimuli can be regulated by means of neutral density
filters. These filters are neither entirely neutral nor completely
uniform, but these variations are not significant for perimetry. The
maximum luminance of the stimuli is standardized at 1000 asb (316 2
cd.m-). The standard GP for kinetic perimetry has 3 neutral density
filters which reduce the luminance by 0.5, 1.0 and 1.5 log units
respectively. The modification of the GP for static perimetry is
supplied with an additional series of four neutral density filters,
which allow luminance steps of 0.1, 0.2, 0.3 and 0.4 log units. The
resulting luminance values, expressed in apostilb, are given in Table I.
TABLE I Luminance values of the Goldmann perimeter 4 3 2 steps lux 1430
450 143 45 3,1 asb 1000 315 100 31,5 3,1 2 cd/m 315 100 31,5 10 3,1 ßL
±30 10 3 3,1 L log L asb 3 2,5 2 2 1,5 0,5 2 Background: 31,5 asb. = 10
cd/m - Coefficient of reflection 0,7. 1 2 (1 asb = -cd/m).
