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PS Fuhr, KH Chung, LD Holmes, S Mitchell, JD Wesley, E McIntosh, JL Elliott, TK Kuyk; Estimations of Functional Vision Correlate with NEI VFQ . Invest. Ophthalmol. Vis. Sci. 2002;43(13):3813.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: The purpose of this study was to determine if combining visual acuity (VA) and visual field (VF) measures in the manner proposed in the 1999 Guide for the Evaluation of Visual Impairment would be more predictive of self-reported visual function than standard vision measures alone. Methods: Quality of life and visual function were assessed in 118 legally blind veterans who signed informed consent and entered a blind rehabilitation program. The NEI VFQ 25 was administered by an interviewer and scored in the standard manner. Visual function tests included visual fields, visual acuities, contrast sensitivity and scanning ability. Binocular VFs were measured with Goldmann kinentic perimetry (III4e, standard luminance) along 12 meridians. Amount of VF remaining (visual field extent, VFE) was determined by the sum of the 12 meridians, corrected for intervening scotomas. The same VF tests were rescored using methodology proposed in the Guide to determine the Functional Field Score (FFS). Monocular and binocular VAs that contribute to the Functional Acuity Score (FAS) were obtained from the subject’s records, and these were combined to determine the Functional Vision Score (FVS). Correlational and stepwise regressional analyses were performed. Results: High correlations were found between VF measures (R=0.95, p<.01) and VA measures (R=0.82, p<.01)). Stepwise regression found FVS to be the best predictor of NEI-VFQ composite score (R=0.341, p<.01), and sub-scale scores of social function, general vision, driving, and dependency. VFE and FFS combined as predictors of the peripheral vision subscale (R=0.582, p<.001). High contrast visual acuity (VAS) and FFS were predictors for the near acuity subscale (R= 0.394, p<.001). General vision subscale score was best predicted by the combination of VFS, VAS, and FVS (R=0.502, p<.001). FAS was the best predictor for distance vision subscale (R=0.271, p=0.003), while VAS was best predictor for color vision subscale (R=0.301, p=0.001). Conclusion: Functional Vision Score (FVS), an estimation of the global ability of the individual that is derived from combining visual acuity scores and visual field scores, was the best overall predictor of self-reported visual function as measured by the NEI VFQ-25. However, correlations were modest, which could be a product of the high level of visual impairment of the sample.
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