Table 5.
Corneal Hysteresis (CH) and Corneal Resistance Factor (CRF) before and after crosslinking (CXL)
| Keratoconus | Post Refractive Surgery Ectasia |
|||||
|---|---|---|---|---|---|---|
| Variable | pre-CXL | post-CXL | P value | pre-CXL | post-CXL | P Value |
| IOPg | 9.79±3.21 | 10.6±3.1 | 0.07 | 9.45±3.08 | 10.9±3.2 | 0.0003* |
| IOPcc | 13.7±2.7 | 14.7±2.5 | 0.03* | 13.6±2.7 | 15.0±3.2 | 0.005* |
| CRF | 6.61±1.67 | 6.6±1.8 | 0.9 | 6.39±2.73 | 6.67±1.24 | 0.1 |
| CH | 7.95±1.30 | 7.62±1.50 | 0.1 | 7.80±0.96 | 7.64±1.13 | 0.5 |
| aindex | 7.19±2.27 | 8.02±2.11 | 0.2 | 8.59±1.84 | 7.77±1.23 | 0.1 |
| bindex | 7.48±2.59 | 8.39±2.42 | 0.1 | 9.20±1.26 | 9.44±0.76 | 0.4 |
| p1area | 2380±1570 | 2470±1420 | 0.8 | 2870±1410 | 3080±1270 | 0.5 |
| p2area | 1840±1210 | 1790±1180 | 0.8 | 2040±850 | 2000±851 | 0.8 |
| aspect1 | 17.9±10.1 | 20.4±14.7 | 0.4 | 21.3±7.5 | 19.3±11.9 | 0.5 |
| aspect2 | 19.8±13.7 | 20.5±13.5 | 0.8 | 24.2±10.4 | 24.5±14.6 | 0.9 |
| uslope1 | 58.6±29.7 | 65.3±49.6 | 0.5 | 76.3±35.4 | 67.3±40.6 | 0.3 |
| uslope2 | 81.8±66.9 | 91.9±51.9 | 0.5 | 107±54 | 116±58 | 0.5 |
| dslope1 | 28.9±18.3 | 32.0±24.8 | 0.5 | 32.8±13.6 | 29.5±21.1 | 0.5 |
| dslope2 | 27.4±17.8 | 28.2±23.8 | 0.9 | 32.6±15.4 | 32.7±23.8 | 1 |
| w1 | 19.7±4.6 | 19.3±6.1 | 0.8 | 19.2±4.2 | 21.7±5.2 | 0.09 |
| w2 | 18.3±8.9 | 15.6±4.74 | 0.2 | 15.3±4.3 | 15.4±3.8 | 0.9 |
| h1 | 334±162 | 329±159 | 0.9 | 390±117 | 372±133 | 0.5 |
| h2 | 295±169 | 290±141 | 0.9 | 341±107 | 337±115 | 0.9 |
| dive1 | 287±157 | 279±155 | 0.9 | 356±126 | 287±163 | 0.06 |
| dive2 | 218±126 | 219±122 | 1 | 259±122 | 234±107 | 0.4 |
| path1 | 33.6±9.3 | 29.6±10.7 | 0.1 | 30.1±8.5 | 26.0±9.3 | 0.1 |
| path2 | 33.5±8.8 | 34.0±13.2 | 0.9 | 31.7±7.5 | 30.8±8.9 | 0.7 |
| mslew1 | 113±55 | 110±57 | 0.8 | 127±51 | 110±48 | 0.2 |
| mslew2 | 132±80 | 136±67 | 0.8 | 159±63 | 166±70 | 0.6 |
| slew1 | 66.7±29.4 | 67.7±47.9 | 0.9 | 79.5±36.9 | 69.1±40.4 | 0.3 |
| slew2 | 88.3±62.5 | 95.7±47.4 | 0.6 | 110±53 | 116.1±57.4 | 0.6 |
| aplhf | 1.86±0.39 | 1.88±0.40 | 0.8 | 1.53±0.33 | 1.69±0.37 | 0.06 |
| p1area1 | 978±701 | 1040±650 | 0.7 | 1210±730 | 1280±620 | 0.7 |
| p2area1 | 777±564 | 761±493 | 0.9 | 867±413 | 859±449 | 0.9 |
| aspect11 | 31.1±16.9 | 29.6±19.1 | 0.8 | 34.5±15.3 | 27.9±18.9 | 0.2 |
| aspect21 | 31.3±18.6 | 30.0±19.7 | 0.8 | 35.3±14.9 | 34.9±18.7 | 0.9 |
| uslope11 | 65.3±35.7 | 70.5±46.3 | 0.7 | 78.8±35.9 | 65.2±43.8 | 0.2 |
| uslope21 | 75.8±65.4 | 72.5±40.9 | 0.8 | 89.5±53.6 | 93.5±52.9 | 0.8 |
| dslope11 | 59.7±42.0 | 48.7±42.6 | 0.3 | 65.6±35.4 | 53.7±40.3 | 0.3 |
| dslope21 | 46.6±27.9 | 45.1±30.6 | 0.8 | 53.5±23.3 | 54.5±34.5 | 0.9 |
| w11 | 7.71±3.00 | 8.79±3.16 | 0.2 | 8.48±3.06 | 10.4±2.9 | 0.02 |
| w21 | 7.46±4.34 | 7.29±2.88 | 0.9 | 7.00±2.15 | 7.37±2.53 | 0.5 |
| h11 | 223±108 | 219±106 | 0.9 | 260±78 | 248±89 | 0.5 |
| h21 | 197±113 | 193±94 | 0.9 | 228±71 | 225±77 | 0.9 |
| path11 | 43.7±12.8 | 38.5±11.7 | 0.1 | 41.6±12.7 | 38.7±12.7 | 0.4 |
| path21 | 41.5±11.3 | 42.0±10.7 | 0.9 | 42.6±11.8 | 43.1±12.7 | 0.9 |
| Concavity Duration | 11.5±0.5 | 11.5±0.5 | 0.5 | 11.7±0.6 | 11.4±0.6 | 0.001 |
| ApplanationOnsetTime | 7.18±0.51 | 7.23±0.53 | 0.5 | 7.12±0.48 | 7.35±0.49 | <0.0001* |
| HLA | 77300±39700 | 77500±37000 | 1 | 85600±26600 | 90600±24200 | 0.1 |
| SlopeUp | 25.8±9.31 | 26.6±14.1 | 0.7 | 34.3±13.3 | 32.8±22.0 | 0.8 |
| SlopeDown | −22.7±15.4 | −25.9±11.2 | 0.3 | −33.9±23.2 | −39.4±54.9 | 0.6 |
| P1P2Avg | 146±23 | 150±22 | 0.2 | 144±22 | 155±24 | <0.0001* |
| A1 | 538±237 | 520±243 | 0.6 | 628±167 | 600±200 | 0.5 |
| A2 | 480±256 | 482±212 | 1 | 559±162 | 557±171 | 0.9 |
| Concavity Mean | 114±53 | 117±52 | 0.6 | 128±35 | 131±34 | 0.6 |
| Impulse | 4080±460 | 4170±363 | 0.2 | 4100±337 | 4260±367 | <0.0001* |
| ApplanationPeakDiff | −57.4±160.0 | −38.2±170.0 | 0.7 | −68.8±128.0 | −43.8±163.1 | 0.5 |
| LagTime | 1.21±0.56 | 0.959±0.646 | 0.2 | 1.03±0.57 | 1.11±0.60 | 0.4 |
| Concavity Min | 53.9±20.4 | 55.5±21.3 | 0.7 | 58.3±13.4 | 60.2±14.3 | 0.4 |
| Concavity Time | 13.1±0.7 | 13.0±0.6 | 0.4 | 13.0±0.5 | 13.2±0.7 | 0.02 |
| Pmax | 363±49 | 373±39 | 0.1 | 365±36 | 383±39 | <0.0001* |
*
denotes significant P value <0.05
**
denotes significant P value <0.0009 for variables after Bonferonni correction