Table 1.
Demographics, characteristics of pterygium, and comparisons of corneal astigmatism and irregularities between eyes.
| Normal contralateral eyes (n = 59) | Pterygium eyes (n = 59) | p | |
|---|---|---|---|
| Age (years) | 62.1 ± 9.2 | ||
| Male:Female | 27:32 | ||
| Pterygium | |||
| Length (mm) | 2.93 ± 1.08 | ||
| Width (mm) | 4.56 ± 1.38 | ||
| Area (mm2) | 9.58 ± 4.80 | ||
| Thickness (mm) | 0.41 ± 0.15 | ||
| Corneal astigmatisma | |||
| With-the-rule (n) | 23 | 42 | |
| Oblique (n) | 9 | 13 | < 0.001* |
| Against-the-rule (n) | 27 | 4 | |
| Magnitude (D) | 0.84 ± 0.47 | 2.07 ± 1.33 | < 0.001† |
| J0 | 0.02 ± 0.42 | 0.76 ± 0.72 | < 0.001†† |
| J45 | − 0.02 ± 0.25 | − 0.32 ± 0.57 | < 0.001† |
| Irregularity of the 3 mm zone (D)b | 1.53 ± 0.61 | 3.67 ± 2.26 | < 0.001† |
| Irregularity of the 5 mm zone (D)b | 1.87 ± 0.68 | 5.04 ± 2.72 | < 0.001† |
D, diopter.
aMeasured by the ATLAS 9000 Corneal Topography System.
bMeasured by the Orbscan II Slit Scanning Corneal Topography/Pachymetry System.
*McNemar-Bowker test.
†Wilcoxon signed-rank tests.
††Paired t-test.