The effects of the constant errors, anticipation and habituation, on measurement of visual fields was investigated in 79 Ss. Visual fields were measured using 8 arc positions on a radius perimeter. On all arc positions, especially in the inferior arc positions, the peripheral threshold means, based on inward movement of the stimulus object, were larger (indicative of a larger field) than those based on outward movements. Peripheral threshold measurement, as conducted in this study, was seen to possess high reliability.
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