Table 3.
Corneal irregularity indices before and after INTACS implantation.
| Parameter | Preoperative | Postoperative | P value | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 2 m | 1 yr | 3 yr | 5 yr | Pre to 2m | Pre to 1yr | Pre to 3 yr | Pre to five yr | ||
| ISV | 100.43 ±34.798 |
104.17 ±32.417 |
98.36 ±32.993 |
91.36 ±28.397 |
89.64 ±28.659 |
0.366 | 1.000 | 0.150 | 0.030* |
| IVA | 0.951 ±0.515 |
1.060 ±0.516 |
1.020 ±0.491 |
0.888 ±0.451 |
0.876 ±0.452 |
0.169 | 0.744 | 0.013* | 0.010* |
| KI | 1.259 ±0.155 |
1.265 ±0.143 |
1.255 ±0.158 |
1.218 ±0.145 |
1.215 ±0.140 |
1.000 | 1.000 | 0.039* | 0.027* |
| Rmin | 5.637 ±0.512 |
5.764 ±0.606 |
5.888 ±0.569 |
5.971 ±0.480 |
5.957 ±0.506 |
0.233 | 0.001* | 0.001* | 0.003* |
ISV = Index of surface variance; IVA = Index of vertical asymmetry; KI = Keratoconus index; Rmin = Minimum radius of curvature. * indicates statistical significance.