The effect of perimetric experience in normal subjects
A. Heijl, G. Lindgren and J. Olsson
Department of Ophthalmology, University of Lund, Malmo General Hospital, Sweden.
Two groups of normal subjects were submitted to repeated automated static
threshold perimetry. Perimetric results were strongly affected by the level
of experience in some subjects; in the majority, however, the effect of
experience was small. Initial field tests often showed high numbers of
depressed points. Sensitivity increased with perimetric training,
particularly between the first sessions. Those subjects who improved most
started low, gradually approaching normal levels with experience. Learning
effects were more pronounced peripherally than paracentrally and
"untrained" fields characteristically showed concentric contraction with
numerous points with low sensitivity peripherally. An important practical
conclusion is to allow repeated testing of all inexperienced patients in
whom initial fields do not agree with clinical findings. A chart showing a
concentrically narrowed field should be viewed with particular suspicion.
Furthermore, a single initial field may constitute an inadequate baseline
for clinical follow-up.
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Hong et al.
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Hutchings et al.
IOVS 2000;41:3429-3436.
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Hudson et al.
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