Table 3 Mean and SD of the new parameters using Corvis ST in the two groups (n = 100 eyes).

From: Corneal biomechanical parameters in keratoconus eyes with abnormal elevation on the back corneal surface only versus both back and front surfaces

Abnormal elevation

Back corneal surface (n = 47)

Both corneal surfaces (n = 53)

p value

Mean ± SD

(95% CI)

Range

Mean ± SD

(95% CI)

Range

Variables

SPA1 (mmHg/mm)

80.75 ± 16.66 (75.86, 85.64)

42.80 to 110.80

61.34 ± 17.66 (56.47, 66.20)

23.00 to 93.90

 < 0.001*

IR (mm−1)

9.01 ± 1.17 (8.66, 9.36)

6.30 to 11.50

10.70 ± 1.49 (10.29, 11.11)

6.90 to 14.60

 < 0.001*

DAR

4.75 ± 0.55 (4.59, 4.92)

3.80 to 6.40

5.46 ± 0.72 (5.25, 5.66)

3.40 to 7.10

 < 0.001*

  1. SD standard deviation, CI confidence interval, SP-A1 stiffness parameter at first applanation, IR integrated radius, DAR deformation amplitude ratio; *parametric statistics.
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