Perimetria computadorizada com estrategias SITA STANDARD e FULL THRESHOLD em individuos normais que realizam o exame pela primeira vez

AUTOR(ES)

Rui Barboso Schimiti

DATA DE PUBLICAÇÃO

2003

RESUMO

The aim of this study is to compare the automated perimetry making use of the conventional Full Threshold strategy to the SITA standard in normal individuals who undergo the visual field exam for the first time. Eighty normal individuals who had never undergone visual field exams before were submitted to automated perimetry with both the conventional Full Threshold strategy and the SITA standard (program 30-2) on the same day, with an interval of 15 minutes. The order of the exams was aleatory, and only one eye per patient was analyzed. Reliability indices, number of unreliable exams, foveal threshold, mean deviation, pattern standard deviation, the glaucoma hemifield test, test duration, the number of points with p<5%, p<2%, p<1% and p<0.5% on the total and pattern deviation probability maps and the specificity of the Full Threshold and SITA standard strategies were compared. Comparative analyses were carried out, including 1) All the exams regardless of the application order; 2) Only the first exams; 3) Only the second exams. The Kruskal-Wallis test was used to analyse continuous variables and the Chi-square or Fischer tests to analyze categoric variables. P values <0.05 were considered statistically significant. When the results of all the Full Threshold and SITA standard exams were analyzed regardless of the order in which they were performed, the number of depressed points with p<5%, p<2% and p<1% in the pattern deviation probability map was significantly greater with the SITA standard strategy (p<0.05). The specificity was 50% for SITA standard and 72.5% for Full Threshold (p=0.006). When only the first exams were compared, the number of depressed points with p<5%, p<2% and p<1% in the total and pattern deviation maps was significantly greater with the SITA standard (p<0.05) and the specificities were 38.1% and 63.16% for the SITA standard and Full Threshold strategies, respectively (p=0.044). When only the second exams were compared, there were no statistically significant differences between the number of depressed points and between the specificities of both strategies (73.69% for SITA standard and 71.43% for Full Threshold) (p>0.05). In conclusion, normal individuals without previous experience with perimetry may present a greater number of points with reduced sensitivity in the pattern deviation probability maps when the SITA standard strategy is used, decreasing the specificity of the test in relation to the Full Threshold. However, these differences disappear in a second exam, suggesting that both strategies behave similarly in perimetrycally experienced individuals

ASSUNTO(S)

sensibilidade campos visuais

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