Table 5:
The prevalence of visual impairment (VI) and blindness in other study
| Place | sample size | Age | Criteria | VI (%) | Blindness (%) | Causes of blindness |
|---|---|---|---|---|---|---|
| India (Rajasthan) (42) | 4284 | 50≤ | WHO | 11.9 | Cataract, refractive errors | |
| Nepal (43) | 4602 | 45≤ | USA | 5.3 | Cataract | |
| China (Doumen) (44) | 5342 | 50≤ | USA | 4.37 | Cataract, refractive errors | |
| India (Aravind) (45) | 5150 | 40≤ | WHO | 4.3 | Cataract, refractive errors | |
| India (46) | 5411 | 50≤ | WHO | 4.1 | Cataract, refractive errors | |
| China (Shunyi) (47) | 5052 | 50≤ | USA | 2.8 | Cataract, refractive errors | |
| Gandaki zone, Nepal (48) | 5000 | 45≤ | USA | 2.6 | Cataract, refractive errors | |
| China (Harbin) (14) | 5057 | 50–96 | WHO | 8.3 | 1.9 | Cataract, corneal opacity |
| India (Andhra Pradesh) (35) | 10293 | All | WHO | 1.84 | Cataract, refractive errors | |
| Hong kong (26) | 3441 | 60≤ | WHO | 7.9% | 1.8 | Refractive errors, cataract |
| Cameroon (Muyuka) (21) | 1787 | 40≤ | WHO | 6.4 | 1.6 | Cataract, refractive errors |
| Mongolia (49) | 4345 | 40≤ | WHO | 1.5 | Glaucoma, cataract | |
| Turkmenistan (50) | 6011 | 50≤ | WHO | 1.26 | Cataract, glaucoma | |
| Cameroon (Limbe) (18) | 2215 | 40≤ | WHO | 3 | 1.1 | Posterior segment disease, Cataract |
| Taiwan(Shihapai) (51) | 1361 | 65≤ | WHO | 0.59 | AMD, retinal disease | |
| Singapore (Tanjong pagor) (52) | 1232 | 40≤ | WHO | 0.5 | Glaucoma, cataract | |
| This study (Sari, Iran) | 937 | 55≤ | WHO | 10.5 | 3.7 | Refractive errors, cataract |
| Iran (Tehran) (27) | 1074 | 40–59 | WHO | 2.51 | 0.59 | Refractive errors, cataract |
| Iran (Tehran) (27) | 385 | 60+ | WHO | 19.98 | 3.55 | |
| Malaysia (33) | 2081 | 40–49 | WHO | 0.31 | Cataract, retinal disease | |
| Malaysia (33) | 1263 | 50–59 | WHO | 0.50 | Cataract, retinal disease | |
| Australia (Victoria) (53) | 4744 | 40≤ | WHO | 0.325 | 0.156 | AMD, glaucoma |
| China (54) | 2115 | 3.59 | cataract, refractive error | |||
| Rural Shandong Province, China (55) | 17 816 | ≥50 | WHO | 7.01 | 1.58 | |
| Shunyi district of Beijing (56) | 5118 | ≥50 | WHO | 8.38 | 1.27 | Cataract, retinal diseases |
| urban Indian population (10) | 3400 | >40 | USA | 3.4 | 0.4 |