TABLE 5.
Surgical coverage for cataract-related severe vision impairment or blindness (< 20/200) and the percentage with presenting visual acuity ≥20/63 in one or both cataract-operated eyes in the 2006 and 2014 surveys.
| Study Site | 2006 Survey | 2014 Survey | 2006–2014 Change a | |||||
|---|---|---|---|---|---|---|---|---|
| Surgical Coverage (%) | Presenting VA ≥20/63 (%) | Effective Surgical Coverage (%) b | Surgical Coverage (%) | Presenting VA ≥20/63 (%) | Effective Surgical Coverage (%) b | Change in Surgical Coverage | Change in Effective Surgical Coverage | |
| Beijing | 62.2 | 69.1 | 43.0 | 83.6 | 78.6 | 65.7 | +34.3% | +52.8% |
| Jiangsu | 38.0 | 51.2 | 19.4 | 57.4 | 68.8 | 39.5 | +51.1% | +103% |
| Guangdong | 45.5 | 48.2 | 21.9 | 63.4 | 69.0 | 43.7 | +39.3% | +99.5% |
| Heilongjiang | 24.4 | 37.5 | 9.16 | 59.4 | 63.2 | 37.5 | +143% | +309% |
| Jiangxi | 32.3 | 29.0 | 9.38 | 77.9 | 51.6 | 40.2 | +141% | +328% |
| Heibei | 41.1 | 56.9 | 23.4 | 70.8 | 67.2 | 47.6 | +72.3% | +103% |
| Chongqing | 27.4 | 54.2 | 14.8 | 69.3 | 78.3 | 54.3 | +153% | +267% |
| Yunnan | 26.3 | 81.0 | 21.3 | 43.3 | 62.4 | 27.1 | +78.2% | +27.2% |
| All Study Sites | 34.5 | 58.4 | 20.2 | 62.6 | 67.8 | 42.4 | +81.4% | +110% |
Change in cataract surgical coverage was calculated as a proportional percentage of the 2006 surgical coverage. P values for differences in surgical coverage over the 2006–2014 interval were determined by tests on equality of proportions; changes were significant at the P <0.001 level except P =0.033 for the change in effective surgical coverage for Yunnan.
Effective surgical coverage is a downward adjustment of surgical coverage to represent only cataract operated persons with a good surgical outcome (≥20/63) in cataract-operated eyes, which corresponds with multiplying the surgical coverage percentage by the presenting visual acuity ≥20/63 percentage.