Impact of Visual Impairment on Health-Related Quality of Life in Multiple Sclerosis
The aim of this study was to evaluate the impact of visual impairment on health-related quality of life (HRQOL) in patients with multiple sclerosis (MS). Patients at an outpatient MS clinic were asked to complete a battery of patient-reported outcome questionnaires. Health-related quality of life was measured using the Hamburg Quality of Life Questionnaire for Multiple Sclerosis (HAQUAMS), while visual impairment was measured using the Visual Function Questionnaire (VFQ). Hierarchical regression was used to determine the relative contribution of visual impairment to HRQOL. Usable responses were obtained for 116 MS patients. Those with higher levels of visual impairment (lower scores on the VFQ) reported significantly lower HRQOL (β = –0.01, P = .0007). Visual impairment also explained an additional 4% variance in the HRQOL scores, independent of disability and depression (ΔR2 = 0.04, F7,108 = 36.58). Overall, disability was the strongest predictor of HRQOL, explaining over 60% of the variation in HRQOL scores. The model explained 70% of the total variance in HRQOL. Given the prevalence of visual impairment and its influence on overall HRQOL, MS patients should be routinely screened using standard ophthalmic examination procedures or self-administered questionnaires such as the VFQ.