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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