Abstract
The normal visual field changes both shape and height with age. Inter-individual, intratest and inter-test variation are not constant across the visual field but depend on eccentricity. Deviations of measured thresholds from the age-corrected normal threshold are non-Gaussian showing significant eccentricity-dependent negative skewness and positive kurtosis. These observations must be taken into account when results of visual field testing are subjected to statistical analysis, or misleading results may be obtained. The degree of perimetric experience of the tested patient as well as the results of reliability tests are other important factors worth considering in the (statistical) evaluation of visual fields. The prevalence of field defects in the normal population might be considerably higher than previously recognized. All field loss in glaucoma suspects should not automatically be attributed to glaucoma.
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