Table 1.
Epidemiology of keratoconus in various countries around the world.
| Study | Country | Prevalence (cases/100,000) | Incidence (cases/100,000) | Age at onset (years) | Keratoconus family history (%) |
|---|---|---|---|---|---|
| Assiri et al. [13] | Saudi Arabia | — | 20 | 18.5 | 16 |
| Hashemi et al. [16] | Iran | 4000 | — | — | — |
| Ziaei et al. [29] | Iran | 2500 | 22.3–24.9 | — | 15 |
| Waked et al. [30] | Lebanon | 3330 | — | — | 12.1 |
| Millodot et al. 2011 [21] | Israel | 2340 | — | — | 22 |
| Shneor et al. [43]∗ | Israel | 3180 | — | — | 0 |
| Shehadeh et al. [31] | Palestine | 1451.6 | — | — | — |
| Jonas et al. [25] | India | 2300 | — | — | — |
| Godefrooij et al. [32] | The Netherlands | 265 | 13.3 | 28.3 | — |
| Nielsen et al. [33] | Denmark | 86 | 1.3 | — | — |
| Pearson et al. [34]∗∗ | United Kingdom | 57, 229 | 4.5, 19.6 | 26.5, 22.3 | — |
| Kennedy et al. [17] | United States | 54.5 | 2.0 | — | — |
∗ n = 10 subjects with keratoconus. ∗∗Data reported for white and Asian populations, respectively.