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Development of the scale of quality of life for diseases with visual impairment
1Zhongzhan Ophthalmic center, Sun Yat-sen University of Medical Sciences, Guangzhou, china.
Purpose:
To describe the development of the of scale quality of life which can measure the quality of life of Chinese patients with visual impairment.
Methods:
Based on a thorough literature search and consultation with ophthalmologists and public health professionals, 20 items were selected to create a scale. Fifty-seven cataract patients with vision impairment and 60 glaucoma patients with vision impairment and visual field loss were measured by the scale to evaluate the validity, reliability and responsiveness of the scale.
Results:
The scale covered four domains of the quality of life (QOL). The criterion related validity of the scale: r = 0.6865 (P = 0.001). The test-retest reliability of the scale: r = 0.8959 (P = 0.001). Coronback's alpha was 0.9359. The variance ratio (VR) of intra-individual variance to inter-individual variance was 0.0551 for overall scores. The correlation coefficient of split-half method was 0.9553. The responsiveness: T-test, T = 5.95 (P = 0.001), effect size statistic was 1.533.
Conclusions:
The result demonstrates that the scale has a satisfactory validity, reliability and responsiveness. It suggests that the scale can be applied to clinical trials.