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KR Woodward, TE Sleep, CF Brito, M Wall; A Comparison of Variabilities . Invest. Ophthalmol. Vis. Sci. 2002;43(13):2024.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To investigate the retest variability of three types of perimetry in a group of normal subjects. Methods: Five ocular normal volunteers ages 26-74 (mean age: 42 ± 19.6) underwent testing using conventional automated perimetry stimulus sizes III and size V, and multifocal visual evoked potential perimetry (mfVEP) five times over a two-week period. Coefficients of variation (CV) were computed for each test and the results compared with a repeated measures ANOVA. The results were also analyzed by z-scores. Results: We found the CV's means and standard deviations to be: size III: 4.52% ± 0.60; size V: 3.29% ± 0.27; mfVEP 16.3% ± 3.02. The differences were statistically significant p < 0.001 except for the CV-III vs. CV-V. The z-score analysis gave similar results. We did not find an increase in variability with visual field eccentricity. Conclusion: The variability of conventional automated perimetry size III and V and the mfVEP are in the acceptable range with size V being the lowest.
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