Research Article
Prevalence of Keratoconus in a Refractive Surgery Population
Table 3
Subject and ocular parameters of normal (LASIK candidate), keratoconus suspects, and keratoconus subjects.
| | | No KC | KC suspect | KC | (N vs KCS) | (N vs KC) | (KCS vs KC) |
| | n (subjects) | 1130 | 400 | 548 | | | | | Subject age (years) | 18.6 ± 4.1 | 24.9 ± 3.8 | 29.3 ± 5.1 | <0.001 | <0.001 | <0.001 | | Family history of KC | 197 (17.4%) | 93 (23.2%) | 149 (27.1%) | 0.009 | <0.001 | 0.174 | | Corneal thickness < 500 µm | — | 321 (80.25%) | 520 (94.8%) | — | — | <0.001 | | Asymmetric bowtie | — | 278 (69.5%) | 493 (89.9%) | — | — | <0.001 | | Corneal steepening ≥ 47 D | — | 356 (89%) | 531 (96.9%) | — | — | <0.001 | | Skewed radial axis > 21° | — | 160 (40%) | 372 (67.9%) | — | — | <0.001 | | Posterior elevation | — | 276 (69%) | 487 (88.9%) | — | — | <0.001 | | I-S asymmetry | — | 324 (81%) | 504 (91.9%) | — | — | <0.001 |
|
|
N = no KC; KC = keratoconus; KCS = KC suspect; I-S = inferior-superior.
|
