A summary of the EQ-5D scale is given in
Table 4 . Results show that a large majority of patients had no problems across all scales, with the exception of pain. The EQ-5D index for utility shows the largest difference between mild and moderate field loss.
The mean value of the EQ-5D index was 0.76 ± 0.19 (SD). In patients with mild visual field loss, the mean EQ-5D index was 0.84 ± 0.17; in moderate visual field loss, 0.68 ± 0.21; and in severe visual field loss, 0.64 ± 0.26.
With respect to other clinical and demographic variables, mobility was linked to age (r = 0.31, P < 0.01); years of diagnosis (r = 0.34, P < 0.01); visual acuity (r = 0.25, P < 0.05); and severity of visual field loss (r = 0.26, P < 0.05). Self-care was linked to acuity (r = 0.34, P < 0.01; and severity of visual field loss (r = 0.33, P < 0.05). Activities and pain were linked to years since diagnosis (r = 0.26 and r = 0.25, with P < 0.05, respectively). Anxiety was linked to visual acuity (r = 0.27, P < 0.05). The summed index score was linked to years since diagnosis (r = 0.26, P < 0.05), visual field loss (χ2 = 20.1, df = 1, P < 0.01), and visual acuity (χ2= 14.3, df = 1, P < 0.01).