Table 1.
Patient characteristics and measured parameters in the KC and Others groups.
| KC (N = 46) | Others (N = 45) | p | |||
|---|---|---|---|---|---|
| Mean | SD | Mean | SD | ||
| Age at PK (years) | 29.5 | 9.4 | 46.1 | 18.1 | < 0.0001 |
| Postoperative period (years) | 27.7 | 8.6 | 25.5 | 10.5 | 0.27 |
| Current age (years) | 57.2 | 10.3 | 71.6 | 15.5 | < 0.0001 |
| Man to woman ratio (%) | 76.1 | – | 44.4 | – | 0.0027 |
| Graft size (mm) | 7.0 | 0.69 | 7.3 | 0.61 | 0.042 |
| ACD (mm) | 3.67 | 0.72 | 2.95 | 0.63 | < 0.0001 |
| CCT (µm) | 570 | 58.1 | 562 | 68.0 | 0.52 |
| IHT (µm) | 509 | 165.7 | 624 | 119.0 | 0.00027 |
| IGT (µm) | 585 | 91.0 | 618 | 96.3 | 0.093 |
| IHT/CCT | 0.90 | 0.32 | 1.12 | 0.23 | 0.00034 |
| IGT/CCT | 1.03 | 0.16 | 1.11 | 0.17 | 0.025 |
| Ks (D) | 57.5 | 8.8 | 51.5 | 6.5 | 0.00035 |
| AvgK (D) | 53.2 | 7.5 | 48.2 | 5.9 | 0.00061 |
| CYL (D) | 8.5 | 6.3 | 6.5 | 4.3 | 0.077 |
| Fourier analysis (D) | |||||
| Spherical | 52.9 | 7.4 | 48.1 | 5.9 | 0.00089 |
| Regular astigmatism | 4.4 | 3.1 | 3.4 | 2.2 | 0.083 |
| Asymmetry | 4.0 | 4.3 | 3.4 | 2.5 | 0.38 |
| HOI | 0.85 | 0.50 | 1.02 | 1.03 | 0.32 |
| Kmax (D) | 66.9 | 14.5 | 59.5 | 11.0 | 0.012 |
KC keratoconus, PK penetrating keratoplasty, ACD anterior chamber depth, CCT central corneal thickness, IHT inferior thinnest host cornea thickness, IGT inferior thinnest graft thickness, IHT/CCT IHT ratio to CCT, IGT/CCT IGT ratio to CCT, Ks steepest corneal power, D diopters, AvgK average corneal power, CYL cylinder, HOI higher order irregularity, Kmax Maximum corneal power.