Table 2 Regional thicknesses of the corneal epithelium, Bowman’s layer and stroma.

From: Value of corneal epithelial and Bowman’s layer vertical thickness profiles generated by UHR-OCT for sub-clinical keratoconus diagnosis

 

Normal (μm)

Sub-KC (μm)

KC (μm)

Epithelium

 Superior region

50.91 ± 3.09

50.27 ± 3.02

51.09 ± 4.29

 Central region

53.48 ± 2.83

51.92 ± 2.57*

46.10 ± 5.31*

 Inferior region

54.94 ± 2.80

54.85 ± 3.36

54.45 ± 5.03

Bowman’s layer

 Superior region

17.18 ± 1.96

16.58 ± 1.75

16.23 ± 2.80

 Central region

17.07 ± 1.51

16.02 ± 2.10*

12.06 ± 2.50*

 Inferior region

17.08 ± 1.35

15.70 ± 1.62*

15.23 ± 2.12*

Stroma

 Superior region

525.27 ± 32.64

512.04 ± 40.82

493.15 ± 32.85*

 Central region

460.32 ± 29.65

454.16 ± 36.25

412.49 ± 39.19*

 Inferior region

533.30 ± 29.03

509.67 ± 38.32*

482.35 ± 38.54*

  1. Normal, normal group; Sub-KC, sub-clinical keratoconus group; KC, keratoconus group; Superior region, 4.23 mm from the superior edge of Bowman’s layer; Central region, central 4.23-mm diameter through the corneal apex; Inferior region, 4.23 mm from the inferior edge of Bowman’s layer; *P < 0.05 compared to the normal group.
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