Comparison of lamellar thickness of anterior, middle and posterior stroma between the central and peripheral areas of the same cornea
| Stromal zone | Corneal area | Lamellae thickness (nm) (mean±SE) | p Value* | |
| Centre (n=sample size) | Periphery (n=sample size) | |||
| Anterior stroma | KC | 600.84±25.10 (n=233) | 686.84±46.47 (n=174) | 0.558 |
| Normal | 1065.03±50.40 nm (n=143) | 1168±62.03 nm (n=130) | 0.447 | |
| Middle stroma | KC | 1151.1±65.48 (n=204) | 1030.3±86.25 (n=153) | 0.012 |
| Normal | 2289.28±116.83 nm (n=114) | 2244.95±106.79 nm (n=113) | 0.822 | |
| Posterior stroma | KC | 783.57±31.10 (n=240) | 615.68±30.94 (n=225) | <0.0001 |
| Normal | 2050.86±124.30 nm (n=107) | 2264.88±101.04 nm (n=93) | 0.02 | |
| Mean lamellar | KC | 828.76±25.753 (n=677) | 752.79±31.978 (n=552) | 0.001 |
| Normal | 1738.24±62.28 nm (n=364) | 1834.05±58.97 nm (n=336) | 0.001 | |
*Wilcoxon Test.
KC, keratoconus; n, number of lamellae; SE: standard error.