Baseline age and ocular characteristics of 10 subjects with the fastest and 10 subjects with the slowest axial elongation (AE) after 24 months of monitoring
| Ortho-k | SVS | P value* | |||||||
| Slow | SD | Fast | SD | Slow | SD | Fast | SD | ||
| N=10 | N=10 | N=10 | N=10 | ||||||
| AE (mm) | −0.05 | 0.12 | 0.70 | 0.10 | 0.28 | 0.08 | 0.98 | 0.09 | 0.000† |
| Age (years) | 9.7 | 1.16 | 8.2 | 0.63 | 9.4 | 1.07 | 7.7 | 1.16 | 0.000† |
| Gender (F/M) | 7/3 | 5/5 | 7/3 | 4/6 | 0.528 | ||||
| Sub. Sph (D) | −2.70 | 1.33 | −1.75 | 1.02 | −2.03 | 1.17 | −1.85 | 0.92 | 0.242 |
| Sub. Cyl. (D) | −1.48 | 1.20 | −0.73 | 0.78 | −1.03 | 0.84 | −1.05 | 1.11 | 0.423 |
| SER (D) | −3.44 | 1.67 | −2.11 | 0.99 | −2.54 | 1.21 | −2.38 | 1.02 | 0.116 |
| AL (mm) | 24.44 | 0.96 | 24.13 | 1.04 | 24.05 | 1.07 | 24.09 | 0.95 | 0.811 |
| Mean K (D) | 44.36 | 1.37 | 43.69 | 1.50 | 44.25 | 1.95 | 44.11 | 1.49 | 0.794 |
| CCT (μm) | 566 | 37.83 | 580 | 21.15 | 583 | 34.15 | 565 | 24.41 | 0.430 |
| IOPg (mm Hg) | 15.82 | 2.92 | 14.76 | 2.22 | 15.53 | 1.87 | 14.12 | 2.27 | 0.373 |
| IOPcc (mm Hg) | 15.57 | 2.65 | 14.99 | 1.99 | 14.39 | 2.05 | 15.07 | 2.54 | 0.735 |
| CRF (mm Hg) | 11.06 | 1.59 | 10.48 | 1.00 | 11.69 | 0.80 | 9.78 | 1.20 | 0.007‡ |
| CH (mm Hg) | 11.04 | 1.38 | 10.73 | 0.79 | 11.90 | 0.87 | 10.15 | 1.28 | 0.011‡ |
*Probability values of analysis of variancefor difference between ortho-k and SVS groups.
†Significant difference between fast and slow progressors in both ortho-k and SVS groups.
AL, axial length; CCT, central corneal thickness; CH, corneal hysteresis; CRF, corneal resistant factor; IOPg, intraocular pressure; IOPcc, corneal compensated intraocular pressure; Ortho-K, orthokeratology group; SVS single-vision spectacles group.