Table 4 Visual improvement after correcting refractive errors
From: Visual impairment and spectacle coverage rate in Baoshan district, China: population-based study
| Â | Â | Correctable | Uncorrectable | Total | Â | ||
|---|---|---|---|---|---|---|---|
| Â | Gained lines | n | %(95%CI) | n | %(95%CI) | n | %(95%CI) |
SVI | Â | 3 | Â | 17 | Â | 20 | Â |
|  | 0line | 0 | 0(0–71.00) | 3 | 17.65(4.00-43.00) | 3 | 15.00(3.00-38.00) |
|  | ≥1 line | 3 | 100(29.00-100.00) | 14 | 82.35(57.00-96.00) | 17 | 85.00(62.00-97.00) |
|  | ≥2 lines | 3 | 100(29.00-100.00 | 9 | 52.94(28.00-77.00) | 12 | 60.00(36.00-81.00) |
|  | ≥3 lines | 3 | 100(29.00-100.00) | 8 | 47.06(23.00-72.00) | 11 | 55.00(31.00-77.00) |
|  | ≥4 lines | 3 | 100(29.00-100.00) | 6 | 35.29(14.00-62.00) | 9 | 45.00(23.00-69.00) |
Mod VI | Â | 156 | Â | 225 | Â | 381 | Â |
| Â | 0line | 0 | 0 | 82 | 36.44(30.16-42.73) | 82 | 21.52(17.40-25.65) |
|  | ≥1 line | 156 | 100(100.00-100.00) | 143 | 63.56(57.27-69.84) | 299 | 78.48(74.35-82.60) |
|  | ≥2 lines | 156 | 100(100.00-100.00) | 103 | 45.78(39.27-52.29) | 259 | 67.98(63.29-72.66) |
|  | ≥3 lines | 156 | 100(100.00-100.00) | 71 | 31.56(25.48-37.63) | 227 | 59.58(54.65-64.51) |
|  | ≥4 lines | 136 | 87.18(81.93-92.43) | 41 | 18.22(13.18-23.27) | 177 | 46.46(41.44-51.46) |
Mild VI | Â | 440 | Â | 132 | Â | 572 | Â |
| Â | 0line | 0 | 0 | 88 | 66.67(58.62-74.71) | 88 | 15.38(12.43-18.34) |
|  | ≥1 line | 440 | 100(100.00-100.00) | 44 | 33.33(25.29-41.38) | 484 | 84.62(81.66-87.57) |
|  | ≥2 lines | 352 | 80.00(76.26-83.74) | 0 | 0 | 352 | 61.54(57.55-65.53) |
|  | ≥3 lines | 193 | 43.86(39.23-48.50) | 0 | 0 | 193 | 33.74(29.87-37.62) |
|  | ≥4 lines | 73 | 16.59(13.11-20.07) | 0 | 0 | 73 | 12.76(10.03-15.50) |
No VI | Â | Â | Â | Â | Â | 3533 | Â |
| Â | 0line | Â | Â | Â | Â | 2276 | 64.42(62.84-66.00) |
|  | ≥1 line |  |  |  |  | 1257 | 35.58(34.00-37.16) |
|  | ≥2 lines |  |  |  |  | 498 | 14.10(12.95-15.24) |
|  | ≥3 lines |  |  |  |  | 92 | 2.60(2.08-3.13) |
|  | ≥4 lines |  |  |  |  | 0 | 0 |
Total | Â | Â | Â | Â | Â | 4545 | Â |
| Â | 0line | Â | Â | Â | Â | 2480 | 54.57(53.12-56.01) |
|  | ≥1 line |  |  |  |  | 2065 | 45.43(43.99-46.88) |
|  | ≥2 lines |  |  |  |  | 1129 | 24.84(23.58-26.01) |
|  | ≥3 lines |  |  |  |  | 529 | 11.64(10.71-12.57) |
|  | ≥4 lines |  |  |  |  | 263 | 5.79(5.11-6.47) |