Table 1 The mean and standard deviation of anterior segment indices in mentally retarded and normal children.
From: Anterior segment indices in mentally retarded children
Cornea indices | Normal | Mental retardation | P-value* |
|---|---|---|---|
Mean ± SD | Mean ± SD | ||
Mean keratometry (diopter) | 43.46 ± 1.56 | 44.05 ± 2.03 | 0.014 |
Minimum keratometry (diopter) | 42.91 ± 1.56 | 43.26 ± 1.91 | 0.123 |
Maximum keratometry (diopter) | 44.00 ± 1.64 | 44.84 ± 2.46 | 0.003 |
Corneal astigmatism (diopter) | 1.09 ± 0.66 | 1.57 ± 1.67 | 0.004 |
Central corneal thickness (micron) | 525.53 ± 47.52 | 535.3 ± 46.68 | 0.098 |
Corneal diameter (mm) | 11.84 ± 0.38 | 11.87 ± 0.42 | 0.553 |
Anterior chamber depth (mm) | 3.15 ± 0.28 | 3.29 ± 0.24 | < 0.001 |
Anterior chamber volume (mm3) | 190.32 ± 33.19 | 198.28 ± 29.52 | 0.039 |
Anterior chamber angle (degree) | 39.9 ± 4.95 | 40.82 ± 5.35 | 0.131 |
Corneal volume | 59.3 ± 4.73 | 60.64 ± 4.64 | 0.023 |
Index of surface variance | 21.13 ± 4.18 | 31.24 ± 19.65 | < 0.001 |
Index of vertical asymmetry | 0.17 ± 0.05 | 0.25 ± 0.18 | < 0.001 |
Keratoconus index | 1.03 ± 0.02 | 1.05 ± 0.06 | < 0.001 |
Central keratoconus index | 1.01 ± 0.01 | 1.01 ± 0.02 | < 0.001 |
Index of height asymmetry | 5.26 ± 4.07 | 9.23 ± 11.51 | < 0.001 |
Index of height decentration | 0.01 ± 0.01 | 0.02 ± 0.02 | < 0.001 |
