[A new strategy for automated static perimetry]

Abstract

The threshold of sensation in perimetry is a range where the probability of perception varies between 0% and 100%. The size of the range is dependent on sensitivity: it increases towards lower sensitivities. A new measurement strategy is presented where the luminance steps between the presentations vary according to the actual luminance level. Luminance steps and threshold variation are always kept in a constant relation. Thus, efficiency of perimetric measurements shall be improved. Already a single crossing of the threshold with dynamic steps gives reproducible results. In one field with 54 points, the mean standard deviation of 3 repeated measurements was 19% greater than that of a conventional 4dB-2dB-double-crossing strategy, but the test time was 56% less.