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Table 3 Comparison of corneal biomechanical parameters between the non-allergic conjunctivitis (NAC) and allergic conjunctivitis (AC) groups

From: Corneal biomechanical changes in allergic conjunctivitis

Parameter NAC AC p
Mean ± SD Mean ± SD
IOP (mmHg) 16.03 ± 2.40 15.90 ± 1.96 0.84a
bIOP (mmHg) 15.70 ± 1.99 15.41 ± 1.86 0.61a
CCT (μm) 555.15 ± 26.73 563.20 ± 27.99 0.32a
A1 time (ms) 7.60 ± 0.27 7.60 ± 0.23 0.97a
A1 velocity (m/s) 0.15 ± 0.02 0.15 ± 0.02 0.72a
A1 length (mm) 2.29 ± 0.31 2.28 ± 0.35 0.94a
A2 time (ms) 22.44 ± 0.43 22.34 ± 0.34 0.39a
A2 velocity (m/s) −0.24 ± 0.05 −0.25 ± 0.03 0.34a
A2 length (mm) 2.10 ± 0.41 2.05 ± 0.37 0.63a
DA (mm) 1.04 ± 0.10 1.04 ± 0.08 0.95a
HC time (ms) 17.43 ± 0.52 17.46 ± 0.35 0.78a
PD (mm) 4.87 ± 0.33 4.84 ± 0.27 0.74a
Radius (mm) 7.38 ± 0.81 7.23 ± 0.75 0.52a
Max DA ratio (2.00 mm) 4.18 ± 0.46 4.15 ± 0.43 0.83a
Max DA ratio (1.00 mm) 1.55 ± 0.05 1.56 ± 0.05 0.69a
ARTh 493.36 ± 56.48 486.94 ± 79.36 0.76a
SP-A1 107.93 ± 15.92 107.93 ± 12.19 0.99a
  Median (P25, P75) Median (P25, P75)  
CBI 0.11 (0.00–0.20) 0.02 (0.00–0.07) 0.15b
TBI 0.04 (0.00–0.14) 0.43 (0.12–0.60) 0.04b
  1. NAC = non-allergic conjunctivitis; AC = allergic conjunctivitis; KC = keratoconus; IOP = intraocular pressure; bIOP = biomechanical-corrected intraocular pressure; CCT = central corneal thickness; A1 = first applanation; A2 = second applanation; DA = deformation amplitude; HC = highest concavity; PD = peak distance; ARTh = Ambrosio relational thickness horizontal; SP-A1 = stiffness parameter at first applanation; CBI = Corvis biomechanical index; TBI = tomography and biomechanical index
  2. a Independent samples t-test
  3. b Mann-Whitney U test