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Table 2 Comparison of corneal tomographic parameters between the non-allergic conjunctivitis (NAC) and allergic conjunctivitis (AC) groups

From: Corneal biomechanical changes in allergic conjunctivitis

Parameter NAC AC pa
Mean ± SD Mean ± SD
CCT (μm) 550.45 ± 21.79 555.80 ± 25.89 0.45
K1 (D) 42.43 ± 1.05 42.50 ± 1.27 0.85
K2 (D) 43.40 ± 1.08 43.91 ± 1.45 0.18
Km (D) 42.90 ± 1.03 43.20 ± 1.28 0.38
Kmax (D) 43.90 ± 1.14 44.52 ± 1.51 0.13
ISV 16.50 ± 4.21 23.40 ± 10.35 0.01
IVA 0.14 ± 0.04 0.19 ± 0.10 0.04
KI 1.03 ± 0.02 1.05 ± 0.03 0.02
CKI 1.01 ± 0.00 1.01 ± 0.01 0.07
IHA 5.05 ± 4.16 6.75 ± 4.04 0.16
IHD 0.01 ± 0.00 0.02 ± 0.01 0.03
BAD-D 0.88 ± 0.37 1.41 ± 0.59 0.001
  1. NAC = non-allergic conjunctivitis; AC = allergic conjunctivitis; CCT = central corneal thickness; K1 = keratometry of the flattest meridian; K2 = keratometry of the steepest meridian; Km = mean central keratometry; Kmax = maximum keratometry; ISV = index of surface variance; IVA = index of vertical asymmetry; KI = keratoconus index; CKI = central keratoconus index; IHA = index of height asymmetry; IHD = index of height decentration; BAD-D = Belin/Ambrosio enhanced ectasia total deviation index
  2. a Independent samples t-test