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  • Title: Validation of French-language versions of the Visual Functioning Index (VF-14) and the Cataract Symptom Score.
    Author: Gresset J, Boisjoly H, Nguyen TQ, Boutin J, Charest M.
    Journal: Can J Ophthalmol; 1997 Feb; 32(1):31-7. PubMed ID: 9047031.
    Abstract:
    OBJECTIVE: To produce and validate French-language versions of the Visual Functioning Index (VF-14), the Cataract Symptom Score (CSS) and two global measures of trouble and satisfaction with vision. DESIGN: Survey by means of telephone interviews conducted 2 weeks apart. SETTING: Ophthalmology clinic of a teaching hospital in Montreal. SUBJECTS: Subjects were recruited among patients with ocular media opacities, such as cataracts and corneal opacities. Of the 71 subjects recruited, 66 (41 French-speaking and 25 French- and English-speaking) completed the study. OUTCOME MEASURES: Visual acuity, scores on vision-related questionnaires and on the 36-Item Short-Form Health Survey (SF-36), a measure of perceived health status. RESULTS: The integral consistency of the French-language versions of the VF-14 and the CSS was high, with Cronbach alpha values of 0.96 and 0.82 respectively. The fidelity with regard to the English-language version, the test-retest reproducibility and the interrater agreement were high (intraclass correlation coefficients > or = 0.80). The correlation between the visual acuity of the better eye and the mean score on all four vision-related measures was statistically significant (p < or = 0.05). The VF-14 scores were also correlated with the score on five of the eight SF-36 subscales (p < or = 0.05). CONCLUSIONS: Our results show that French-language versions of the VF-14, CSS and global measures of trouble and satisfaction with vision are reliable and valid.
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