Table 2 Prevalence of cataract in Asia, major population based studies.
| Year | Study and location | Population | Cataract assessment | Prevalence of cataract | ||||
|---|---|---|---|---|---|---|---|---|
| Any | Nuclear | Cortical | PSC | |||||
| 1982 | Punjab, India53 | 1269, ⩾30 years | Clinical assessment, VA<6/18 | 15.1% | ||||
| 1994 | Mongolia41 | 4345, ⩾40 years | Clinical assessment, no VA criteria | 8.3% | ||||
| 1989 | Tibet, China54 | 1292, ⩾40 years | LOCS, VA<6/12 | 14.6% | 2.2% | 7.3% | 2.7% | |
| 1989 | Shunyi county, China55 | 6902, >40 years | LOCS, VA<6/12 | 18.6% | ||||
| 2000 | Taipei, Taiwan56 | 2038, ⩾50 years | Clinical assessment, no VA criteria | 51.0% | 35.0% | 7.8% | 15.3% | |
| 2002 | Tanjong Pagar Survey, Singapore15 | 1206, ⩾40 years | LOCS III, no VA criteria | 34.7% | 22.6% | 23.9% | 7.0% | |
| 2003 | Aravind Eye Study, India29 | 5150 ⩾40 years | LOC III, no VA criteria | 61.9% | 59.7% | 20.0% | 24.3% | |
| 2003 | Shihpai Eye Study, Taiwan7 | 2045 ⩾65 years | LOCS III, no VA criteria | 59.2% | 38.9% | 21.9% | 9.2% | |
| 2005 | Sumatra Eye Study, Indonesia33 | 919, ⩾21 years | LOCS III, no VA criteria | 23.0% | 35.7% | 30.1% | 15.1% | |
| 2005 | Andhra Pradesh Eye Study, India57 | 7416, ⩾16 years | LOCS III and Wilmer, no VA criteria | 14.4% | 9.2% | 5.5% | 6.0% | |
LOCS, Lens Opacities Classification system; PSC, posterior subcapsular cataract; VA, visual acuity.