VISUAL IMPAIRMENT AND BLINDNESS 129 TABLE 4-18. DISTRIBUTION, ESTIMATED NUMBER OF CASES, AND PREV- ALENCE OF BLINDNESS BY REGION (NBS 1981) Estimated Number of Cases Percentage of Nepal's Total Sample N Prevalence (per 100)a Terrain Eastern Central Western Fai· West A Far West B Subtotal Missing 9,819 12,347 7,548 5,665 4,172 39,551 336 29,785 37,591 18,127 17,811 14,309 117,623 NA 0.86 (0.89) 0.82 (0.77) 0.69 (0.60) 0.92 (1.06) 0.97 (0.95) 0.84 NA 25.3% 32.0 15.4 15.1 12.2 100.0 NA Total 39,887 117,623 0.84 100.0 Source: FR4.003 AN.2 aFigures in parentheses are age-sex-standardized blindness prevalence rates. TABLE 4-19. DISTRIBUTION, ESTIMATED NUMBER OF CASES, AND PREV- ALENCE OF UNILATERAL BLINDNESS BY REGION (NBS 1981) Estimated Number of Cases Percentage of Nepal's Total Terrain Sample N Prevalence (per 100) 9,818 12,347 7,546 5,661 4,171 39,543 344 44,170 68,387 45,114 41,162 34,779 233,612 0 1.28 1.49 1.73 2.12 2.37 1.66 NA 18.9% 29.3 19.3 17.6 14.9 100.0 NA Eastern Central Western Far West A Far West B Subtotal Missing Total 39,887 233,612 1.66 100.0 Source: FR4.003 AN.2 standardized blindness prevalence rate (1.63%). Narayani zone, with 12. 7 percent of Nepal's blindness, has the highest number of blind (14,953), followed by Koshi zone, with 10.8 percent of Nepal's total blind (12,685). The same trends are found for unilateral blind- ness (Table 4-21). Figure 4.1 shows the age-sex-standardized prevalence rates. When age-sex-standardized prevalence rates are used, it becomes
