Table 2.
Corneal Higher-Order Aberrations Parameters in Normal, Suspect Keratoconus, and Normal Groups.
| Anterior HOAs | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Indices | Normal (n = 108) | SKC (n = 42) | KC (n = 70) | p-Value | p * | |||||
| Mean | SD | Mean | SD | Mean | SD | Normal vs. SKC | Normal vs. KC | SKC vs. KC | ||
| Total HOAs | 0.28 | 0.14 | 0.73 | 0.34 | 2.11 | 0.90 | <0.0001 | <0.0001 | <0.0001 | <0.0001 |
| Trefoil Z (3, ±3) | 0.12 | 0.07 | 0.30 | 0.23 | 0.56 | 0.27 | <0.0001 | <0.0001 | <0.0001 | <0.0001 |
| Coma Z (3, ±1) | 0.15 | 0.13 | 0.55 | 0.29 | 1.90 | 0.88 | <0.0001 | <0.0001 | <0.0001 | <0.0001 |
| Spherical Z (4, 0) | 0.02 | 0.15 | −0.15 | 0.18 | 0.16 | 0.35 | <0.0001 | <0.0001 | <0.0001 | <0.0001 |
| Posterior HOAs | ||||||||||
| Total HOAs | 0.21 | 0.12 | 0.27 | 0.16 | 0.85 | 0.48 | 0.609 | <0.0001 | <0.0001 | <0.0001 |
| Trefoil Z (3, ±3) | 0.13 | 0.10 | 0.18 | 0.14 | 0.60 | 0.38 | 0.82 | <0.0001 | <0.0001 | <0.0001 |
| Coma Z (3, ±1) | 0.08 | 0.09 | 0.11 | 0.08 | 0.38 | 0.26 | 0.883 | <0.0001 | <0.0001 | <0.0001 |
| Spherical Z (4, 0) | 0.04 | 0.06 | −0.02 | 0.04 | −0.08 | 0.11 | <0.0001 | |||
n: number; SKC = suspect keratoconus; KC = Keratoconus; HOAs = higher-order aberrations; Z = Zernike; p: compares means between each two group. p *: compares the difference among the three groups; statistically significant values (p < 0.05). Values in bold are statistically significant.