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Table 5 Comparison of corneal densitometry parameters between the non-allergic conjunctivitis (NAC) and allergic conjunctivitis (AC) groups

From: Corneal biomechanical changes in allergic conjunctivitis

Densitometry NAC AC pa
Mean ± SD Mean ± SD
0–2 mm
 Anterior layer 22.07 ± 1.22 23.12 ± 2.28 0.07
 Central layer 13.45 ± 0.95 13.73 ± 0.76 0.26
 Posterior layer 9.58 ± 1.01 9.92 ± 0.68 0.16
 Average 15.02 ± 0.85 15.57 ± 1.04 0.05
2–6 mm
 Anterior layer 19.60 ± 0.96 20.41 ± 1.66 0.05
 Central layer 11.97 ± 0.53 12.27 ± 0.58 0.07
 Posterior layer 8.82 ± 0.79 9.13 ± 0.56 0.11
 Average 13.55 ± 0.62 13.92 ± 0.76 0.07
6–10 mm
 Anterior layer 18.30 ± 1.65 22.91 ± 4.02 < 0.001
 Central layer 11.73 ± 1.01 12.93 ± 1.83 0.01
 Posterior layer 9.39 ± 0.79 10.09 ± 1.47 0.06
 Average 13.14 ± 1.06 15.31 ± 2.06 < 0.001
10–12 mm
 Anterior layer 27.61 ± 7.33 34.37 ± 6.05 0.001
 Central layer 19.24 ± 4.86 18.25 ± 3.27 0.39
 Posterior layer 14.13 ± 2.65 13.23 ± 3.67 0.35
 Average 20.32 ± 4.55 22.50 ± 3.37 0.06
Total
 Anterior layer 20.79 ± 1.15 23.71 ± 2.40 < 0.001
 Central layer 13.26 ± 0.80 13.69 ± 1.18 0.16
 Posterior layer 9.96 ± 0.71 10.20 ± 1.10 0.40
 Average 14.66 ± 0.72 15.83 ± 1.16 < 0.001
  1. NAC = non-allergic conjunctivitis; AC = allergic conjunctivitis
  2. a Independent samples t-test