Table 2.
Mean and SD of corneal curvature, best fit sphere radius, maximum elevation, thickness and thickness profile using Pentacam separately in the two groups (n = 100 eyes).
| Abnormal elevation | Back corneal surface (n = 47) | Both corneal surfaces (n = 53) | P value | ||
|---|---|---|---|---|---|
| Mean ± SD (95% CI) |
Range | Mean ± SD (95% CI) |
Range | ||
| Variables | |||||
| Front mean-KR (D) | 44.97 ± 1.77 (44.45, 45.49) | 41.20 to 48.70 | 48.46 ± 3.18 (47.58, 49.34) | 42.55 to 59.50 | < 0.001 |
| Front CA (D) | 2.08 ± 1.43 (1.66, 2.50) | − 3.30 to 5.00 | 3.79 ± 1.56 (3.36, 4.22) | − 0.10 to 6.60 | < 0.001* |
| Front CA-axis (º) | 97.90 ± 51.91 (82.66, 113.14) | 0.30 to 179.80 | 85.44 ± 50.87 (71.42, 99.47) | 2.20 to 168.10 | 0.191 |
| Front BFS radius (mm) | 7.70 ± 0.29 (7.62, 7.79) | 7.12 to 8.53 | 7.36 ± 0.34 (7.27, 7.46) | 6.15 to 8.33 | < 0.001* |
| Front maximum elevation (µm) | 11.04 ± 2.68 (10.24, 11.85) | 6 to 16 | 29.08 ± 9.05 (26.51, 31.65) | 18.0 to 60.0 | < 0.001 |
| Front K-max (D) | 48.28 ± 2.29 (47.61, 48.96) | 44.70 to 54.30 | 55.92 ± 4.99 (54.54, 57.30) | 46.20 to 70.40 | < 0.001 |
| I-S asymmetry (D) | 2.16 ± 1.28 (1.78, 2.54) | − 1.50 to 4.50 | 6.57 ± 2.58 (5.86, 7.29) | 2.30 to 14.30 | < 0.001 |
| Back mean-KR (D) | − 6.52 ± 0.34 (− 6.62, − 6.42) | − 7.25 to − 5.75 | − 7.17 ± 0.65 (− 7.35, − 6.99) | − 9.70 to − 6.25 | < 0.001 |
| Back CA (D) | − 0.54 ± 0.22 (− 0.60, − 0.47) | − 1.10 to − 0.10 | − 0.81 ± 0.26 (− 0.88, − 0.74) | − 1.40 to − 0.30 | < 0.001 |
| Back CA-axis (º) | 104.52 ± 48.08 (90.41, 118.64) | 16.50 to 179.50 | 91.40 ± 51.68 (77.15, 105.64) | 1.70 to 173.90 | 0.216 |
| Back BFS radius (mm) | 6.31 ± 0.37 (6.20, 6.42) | 4.45 to 7.14 | 6.16 ± 0.26 (6.09, 6.24) | 5.68 to 6.82 | 0.029* |
| Back maximum elevation (µm) | 30.27 ± 7.48 (28.02, 32.51) | 18 to 44 | 57.92 ± 12.85 (54.27, 61.57) | 37.0 to 88.0 | 0.001* |
| CCT (µm) | 494.76 ± 28.09 (486.51, 503.01) | 433 to 558 | 458.52 ± 29.47 (450.40, 466.65) | 388 to 533 | < 0.001* |
| CTP (µm) | 482.85 ± 27.60 (474.75, 490.95) | 426 to 545 | 447.64 ± 29.07 (439.62, 455.65) | 377 to 515 | < 0.001* |
| ART (µm) | 219.51 ± 44.77 (206.36, 232.65) | 147.00 to 317.00 | 152.83 ± 43.92 (140.72, 164.93) | 35.00 to 313.00 | < 0.001* |
| ARTh (µm) | 299.58 ± 63.28 (280.99, 318.16) | 197.90 to 479.50 | 181.71 ± 66.20 (163.46, 199.96) | 50.80 to 430.80 | < 0.001* |
| PImax | 2.27 ± 0.38 (2.16, 2.38) | 1.62 to 3.15 | 3.15 ± 1.09 (2.85, 3.45) | 1.51 to 9.28 | < 0.001 |
| PIave | 1.54 ± 0.21 (1.48, 1.61) | 1.22 to 2.03 | 2.12 ± 0.71 (1.93, 2.32) | 1.01 to 6.36 | < 0.001 |
| BAD-D | 4.70 ± 1.60 (4.23, 5.18) | 2.75 to 12.47 | 9.01 ± 3.25 (8.12, 9.91) | 3.35 to 19.87 | < 0.001 |
SD standard deviation, CI confidence interval, KR keratometry reading, CA corneal astigmatism, BFS best fit sphere, CCT central corneal thickness, CTP corneal thinnest point, ART ambrosio relational thickness, ARTh ambrósio’s relational thickness to the horizontal profile, PPImax maximum pachymetric progression index, PPIave average pachymetric progression index, IS inferior-superior difference value, BAD-D Belin-Ambrosio Enhanced Ectasia Total Deviation Index; *parametric statistics.