PURPOSE: To assess the native and the previously Rasch-modified National Eye Institute Visual Function Questionnaire (NEI VFQ) scales in a Chinese population.
SETTING: Eye Hospital of Wenzhou Medical University, Wenzhou, China.
DESIGN: Questionnaire development.
METHODS: Patients on the waiting list for cataract surgery completed the 39-item NEI VFQ (NEI VFQ-39). Rasch analysis was performed in 3 steps as follows: (1) Assess the psychometric properties of the original NEI VFQ. (2) Reassess the previously proposed Rasch-modified NEI VFQ scales by Pesudovs et al. (2010) in Chinese populations. (3) Compare the scores of previously recommended scales of the NEI VFQ with new Rasch-modified scales of the same questionnaire using Bland-Altman plots.
RESULTS: Four hundred thirty-five patients (median age 70 years; range 35 to 90 years) completed the NEI VFQ-39. Response categories for 4 question types were dysfunctional and therefore repaired. The original NEI VFQ-39 and NEI VFQ-25 showed good measurement precision. However, both versions showed multidimensionality, misfitting items, suboptimum targeting, and nonfunctioning subscales. Using the previously proposed Rasch-modified scales of the NEI VFQ yielded valid measurement of each construct in the 39-item and 25-item questionnaire. Comparison between the earlier proposed NEI VFQ scales and the new versions developed in this population showed good agreement.
CONCLUSIONS: The original NEI VFQ was once again found to be flawed. The previously proposed Rasch-analyzed versions of the NEI VFQ and the new Chinese versions showed good agreement.
- Aged, 80 and over
- Asian Continental Ancestry Group
- Cross-Cultural Comparison
- Middle Aged
- National Eye Institute (U.S.)
- Reproducibility of Results
- Sickness Impact Profile
- Surveys and Questionnaires
- United States
- Vision Disorders
- Vision, Ocular
- Visual Acuity
- Comparative Study
- Journal Article
- Validation Studies