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Total deviation probability plots for stimulus
size V perimetry: a comparison with size III stimuli.
(Symboles de probabilité de la déviation totale
en périmétrie avec un stimulus de taille V : une comparaison avec un stimulus de
taille III)
Wall M, Brito
CF, Woodward KR, Doyle CK, Kardon RH, Johnson CA.
Department of Neurology, University of Iowa,
College of Medicine, Veterans Administration Hospital, 200 Hawkins Dr, Ste 2007,
Roy Carver Pavilion, Iowa City, IA 52242-1053, USA.
michael-wall@uiowa.edu
OBJECTIVE: To compare empirical probability plots in patients with glaucoma for size V and III perimetry testing.
METHODS: We computed empirical probability plot percentile limits after testing 60 age-matched controls tested with both size III (Swedish interactive thresholding algorithm) and size V (full threshold) perimetry twice. Probability plots of 120 patients with glaucoma tested in the same way were computed. We compared the number of abnormal test locations in the 2 stimulus sizes; we then compared these results with those from size III StatPac software (Zeiss Humphrey Systems, Dublin, California) using 2-way repeated-measures analysis of variance.
RESULTS: We found a similar number of abnormal test locations (P < or = .05) for the size III and size V testing conditions identified by the probability plots (no significant difference); there were significantly fewer abnormal locations using StatPac (size III) than from our size III database. When results were stratified by mean deviation, the mild visual loss group again did not show any significant differences between sizes III and V.
CONCLUSIONS: Size V full-threshold testing gives a similar number of abnormal test locations in patients with glaucoma compared with the size III Swedish interactive thresholding algorithm standard test. Size V testing, with its greater dynamic range and lower variability, may be a viable alternative to size III testing in patients with glaucoma.
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(Dernière mise à jour de cette page le 31/07/08)