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Performance-based measurement may correlate better than self-report questionnaires
Retina. 2009;29(1):80-90.
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A performance-based measure of visual ability, called the assessment of disability related to vision, validated visual disabilities in a population of patients with age-related macular degeneration.
Data provided by the analysis system, known also as ADREV, showed a higher correlation with clinical indications of visual impairment when compared with the National Eye Institute visual function questionnaire (VFQ). Performance-based measurement systems, such as ADREV, are less likely to be influenced by reporting bias and other subjective factors that may undermine findings, according to the study.
The ADREV took patients longer to complete: 35 minutes vs. 11 minutes. However, “a one-sample t test between the mean absolute magnitude of the correlations between the clinical measures and both the ADREV and VFQ, demonstrated that the ADREV had a statistically significant higher average relationship with the clinical measures than did the VFQ (P < .001),” the study said.