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The VF-14. An index of functional impairment in patients with cataract.

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TLDR
The VF-14 is a reliable and valid measure of functional impairment caused by cataract and provides information not conveyed by visual acuity or a general measure of health status.
Abstract
Objective: To describe the development and the performance of a brief questionnaire designed to measure functional impairment caused by cataract (the VF-14). Design: Observational cross-sectional study. Patients were recruited between July 15 and December 15, 1991. Setting: Patients were recruited from the practices of 70 ophthalmologists, located in Columbus, Ohio (N=21), St Louis, Mo (N=26), and Houston, Tex (N=23). Patients: Seven hundred sixty-six patients undergoing cataract surgery for the first time. Main Outcome Measures: Preoperative best corrected visual acuity in each eye; scores on the VF-14, a new index of functional impairment in patients with cataract; patient reports of overall trouble and satisfaction with their vision; and scores on the Sickness Impact Profile, a measure of general health status. Results: The VF-14 has high internal consistency (Cronbach's α=.85) and correlates more strongly with the overall self-rating of the amount of trouble and satisfaction patients have with their vision than do several measures of visual acuity or the Sickness Impact Profile score. The VF-14 score is moderately correlated with visual acuity in the better eye. Conclusions: The VF-14 is a reliable and valid measure of functional impairment caused by cataract and provides information not conveyed by visual acuity or a general measure of health status.

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Citations
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Journal ArticleDOI

Development of the 25-item National Eye Institute Visual Function Questionnaire.

TL;DR: Preliminary analyses indicate that the psychometric properties of the NEI VFQ-25 are robust for the eye conditions studied; this suggests that the measure will provide reproducible and valid data when used across multiple conditions of varying severity.
Journal ArticleDOI

Psychometric properties of the National Eye Institute Visual Function Questionnaire (NEI-VFQ). NEI-VFQ Field Test Investigators

TL;DR: Estimates of internal consistency and test-retest reproducibility indicate that the 51-item NEI-VFQ is reliable and valid and should be a useful tool for group-level comparisons of vision-targeted, health-related quality of life in clinical research.
Journal ArticleDOI

The routine use of patient reported outcome measures in healthcare settings.

TL;DR: In this article, the authors provide a guide for individuals who are interested in using patient reported outcome measures at a local level, however, a number of pitfalls await clinicians with limited expertise.
Journal ArticleDOI

Rationale and methodology for a population-based study of eye diseases in Malay people: The Singapore Malay eye study (SiMES).

TL;DR: Data from this study allow further understanding of the etiology and impact of eye diseases in this ethnic group and provide population-based data on the prevalence of and risk factors for age-related eye disease in people of Malay ethnicity in Singapore.
References
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Journal ArticleDOI

Coefficient alpha and the internal structure of tests.

TL;DR: In this paper, a general formula (α) of which a special case is the Kuder-Richardson coefficient of equivalence is shown to be the mean of all split-half coefficients resulting from different splittings of a test, therefore an estimate of the correlation between two random samples of items from a universe of items like those in the test.
Journal ArticleDOI

The MOS 36-item short-form health survey (SF-36). I. Conceptual framework and item selection.

John E. Ware, +1 more
- 01 Jun 1992 - 
TL;DR: A 36-item short-form survey designed for use in clinical practice and research, health policy evaluations, and general population surveys to survey health status in the Medical Outcomes Study is constructed.
Journal ArticleDOI

The Sickness Impact Profile: development and final revision of a health status measure.

TL;DR: In this article, the authors developed the Sickness Impact Profile (SIP), a behaviorally based measure of health status, and evaluated its reliability and validity using multitrait-multimethod technique.
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