Biomechanical Properties in Different Types of Thin Corneas in Menoufia Population

Table 3

Central corneal thickness (CCT) and the corneal hysteresis (CH) and the corneal resistance factor in three groups.

		Group 1 (normal thin)	Group 2 (keratoconus suspect)	Group 3 (keratoconus)
CCT	Mean ± SD (in μm)	490.60325 ± 7.0776848	487.64233 ± 7.470756	484.3142 ± 8.415676
	Range (in μm)	470–500	470–500	470–500
	value	0.059
CH	Mean ± SD (in mmHg)	8.6893 ± 1.7757	9.0512 ± 1.11909	8.1297 ± 0.85395
	Range (in mmHg)	5.9–14.20	7.30–10.80	6.30–10.90
	value	Between groups 1 and 2	0.713
		Between groups 2 and 3	0.149
		Between groups 1 and 3	0.711
CRF	Mean ± SD (in mmHg)	8.4413 ± 1.6632	8.3373 ± 1.1144	7.2422 ± 1.3110
	Range (in mmHg)	5.6–12.50	6.70–10.10	5–10.00
	value	Between groups 1 and 2	0.94
		Between groups 2 and 3	0.075
		Between groups 1 and 3	0.021