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Table 4 Visual improvement after correcting refractive errors

From: Visual impairment and spectacle coverage rate in Baoshan district, China: population-based study

   Correctable Uncorrectable Total  
  Gained lines n %(95%CI) n %(95%CI) n %(95%CI)
SVI   3   17   20  
  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   156   225   381  
  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   440   132   572  
  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       3533  
  0line      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       4545  
  0line      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)