Threshold Fluctuations, Interpolations and Spatial Resolution in Perimetry

Abstract

The detrimental effect of threshold fluctuations upon detectability of sensitivity loss is emphasized. The only remedy seems to consist in the application of averaging methods, thereby attenuating threshold noise with computer methods. Two scanning methods directed at a rapid and accurate detection of scotomata are considered. In the first, the scanning points are distributed as a rectangular grid. In the second, the points are aligned along meridians. The average detectability of the first method is rated superior and is therefore preferred. Furthermore, particular consideration is given to the role of interpolation procedures played in perimetry.