Determining Spatial Summation and Its Effect on Contrast Sensitivity across the Central 20 Degrees of Visual Field
Fig 1
Composite figure of visual field patterns (A) and estimated dB loss/decade (B). (A) Fundus photograph with the 10–2 test pattern being superimposed on the 30–2 pattern showing the higher sampling within the central 20° diameter in the 10–2 pattern compared to the 30–2 test grid. The grey dots and blue dots belong to the 10–2 and 30–2 pattern, respectively. The red dots are common test points to the 10–2 and 30–2 test grids. (B) Estimated sensitivity loss (dB) per decade of life at each HFA 10–2 test location. Grey shaded locations indicate data extracted from Heijl et al. [5] All other values were calculated as a weighted average of the nearest three known correction factors from Heijl et al [5] and used to correct subject data to a single 50-year-old age equivalent.