Abstract
We assessed the variability of point-wise static threshold values and the components of fluctuation outside the central 30° field in 20 normal individuals tested on the Humphrey field analyzer. We found a mean short-term fluctuation of 2.37 dB, a long-term heterogeneous fluctuation of 5.28 dB, and a long-term homogeneous fluctuation of 1.10 dB. All components of fluctuation were greatest superiorly. Point-wise variation was highest superiorly and nasally and increased with greater eccentricity from fixation in all but the temporal quadrant. Also, point-wise variation was greater between individual than between tests in a single individual. This study suggests that outside the central 30° field, changes in individual threshold measurements in the superior and nasal quadrants should be greater than those in the temporal or inferior quadrants before they can be distinguished from normal variation.
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Young, W.O., Stewart, W.C., Hunt, H. et al. Static threshold variability in the peripheral visual field in normal subjects. Graefe's Arch Clin Exp Ophthalmol 228, 454–457 (1990). https://doi.org/10.1007/BF00927261
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DOI: https://doi.org/10.1007/BF00927261