Table 3 Comparison of anterior, centre, and posterior corneal densitometry values

 0–2 mm

19.70 ± 1.52

(17.30–22.50)

19.19 ± 1.69

(17.10–22.30)

18.91 ± 2.18

(15.30–21.80)

0.391

 2–6 mm

17.59 ± 1.24

(15.40–19.70)

17.00 ± 1.26

(15.40–19.90)

17.29 ± 1.33

(15.00–18.90)

0.380

 6–10 mm

17.16 ± 2.25

(14.20–21.70)

17.83 ± 3.50

(14.80–27.20)

17.20 ± 2.54

(14.40–25.90)

0.714

 10–12 mm

28.76 ± 7.02

(19.00–37.20)

29.27 ± 4.77

(18–36.50)

27.44 ± 88

(14.70–37.00)

0.075

Mid stroma

6–10 mm

 0–2 mm

12.60 ± 0.98

(11.10–14.80)

12.30 ± 0.77

(11.50–14.50)

12.85 ± 0.70

(11.80–14.00)

0.132

I–II: 0.002

II–III: 0.004

 2–6 mm

11.27 ± 0.78

(9.80–12.60)

11.41 ± 1.02

(10.50–14.80)

11.51 ± 0.54

(10.30–12.30)

0.636

10–12 mm

 6–10 mm

11.03 ± 1.14

(9.30–14.40)

15.53 ± 6.57

(10.10–29.10)

11.32 ± 1.33

(9.90–14.90)

0.001

I–II: 0.031

II–III: 0.014

 10–12 mm

18.96 ± 2.86

(14.60–23.60)

20.42 ± 5.43

(13.90–31.80)

16.21 ± 4.57

(8.30–26.60)

0.015

Posterior (120 μm)

2–6 mm

 0–2 mm

10.59 ± 0.80

(9.40–12.50)

10.40 ± 0.76

(9.60–11.80)

10.70 ± 0.87

(9.10–12.50)

0.534

I–II: 0.035

II–III: 0.038

 2–6 mm

9.82 ± 0.72

(8.90–11.20)

11.53 ± 3.45

(8.90–18.00)

10.00 ± 0.73

(8.70–11.20)

0.023

6–10 mm

 6–10 mm

12.32 ± 4.55

(9.30–24.90)

34.37 ± 4.23

(23.20–41.40)

10.51 ± 1.21

(8.70–13.60)

<  0.001

I–II: <  0.001

II–III: <  0.001

 10–12 mm

16.68 ± 3.87

(11.70–25.30)

35.10 ± 4.09

(24.40–42.40)

13.83 ± 3.78

(7.60–21.60)

<  0.001

10–12 mm

I–II: <  0.001

I–III: 0.038

II–III: <  0.001