Grundlagen exakter Perimetrie

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Abstract
The variability and quantitative dependence of the visual field on brightness of background, brightness of the object and size of object were studied. The size of the visual field is relatively slightly affected by changes in the absolute values and I and [DELTA]I, while it is very sensitive to changes of the quotient [DELTA]I/I. Some summation of excitation of small retinal areas takes place, but the larger the test field, the more incomplete it is. The summation effect varies with the particular type of vision: distinctive perception decreases it, dark adaptation increases it. The effect of blurred images produced by opaque media on the visual field is evaluated. Basic data for a quantitative comparison of the sensitivity of individual retinal points are given.

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