Reproducibility of central field results using the Humphrey Field Analyser in normal subjects

Repeated measurements of threshold for the central 10^o visual field were made on normal subjects with the Humphrey Field Analyser. Two examiners repeated the visual field measurement for each subject, giving four readings in all. Visual field results were divided into concentric zones, where each zone area was double the area of the preceding zone, and also into quadrants. There was no significant difference between the results obtained from each examiner and, after the four trials, there was not a significant learning effect. The results showed no significant difference between quadrant divisions for each zone, but there were significant differences between zones and between subjects.