Perimetric findings in functional disorders using automated techniques.

Visual fields were assessed by automated static thresholding techniques in 15 consecutive patients with functional visual loss. Although field abnormalities were recorded in all patients, the pattern of abnormality was not distinguishable from organic loss. Furthermore, no form of reliability testing, including numbers of repetitions, false-positives or false-negatives, root mean square (RMS) evaluation, or percentage of fixation losses, was capable of characterizing functional defects. The authors conclude that automated perimetry, as currently practiced, cannot differentiate functional from organic visual field loss.