SOD1 and age-related macular degeneration: The SOD1 levels were found to be higher among hypertensive patients (Figure 2(b), Table 2, P = 0.015), those with heart disease (Figure 2(c), Table 2, P = 0.002) and male AMD patients (Figure 2(d), Table 2, P = 0.035), as compared to nonhypertensive patients or those without heart disease and female AMD patients, respectively.