Cataract Blindness Prevalence

Sample size was calculated on the basis of estimating a blindness prevalence of 8 with an error bound precision of 15 with 95 confidence. Figure 1 below shows the estimated prevalence rate for cataract from the seven studies reviewed in this section. Blindness was more prevalent in the older age group and in women.

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Cataract was the leading cause of blindness 79 4.

Cataract blindness prevalence.

Good visual outcome in the cataract operated eyes was 62 presenting and 75 2 best corrected. Csc was 41 5 in cataract blind eyes and 48 6 in cataract blind people. The prevalence of cataract blindness was higher in punjab province in rural areas and among illiterate participants. Prevalence rates ranged from 2 8 in proyecto ver to 29 5 in ucla mec.

The high degree of variation among the results in this figure is likely due to in part to methodological disease definition and population differences among the studies. Aao outlines the breakdown of legal blindness associated with eye disorders and diseases according to ethnic group. Cataract prevalence and magnitude. A total of 289 participants were blind with cataract as the cause crude prevalence 1 75 95 ci 1 55 to 1 96 table 1 1.

Assuming an examination response rate of 85 and a design effect of 2 0 to account for the cluster sampling design a sample size of 4514 persons 50 years of age is required. The pooled prevalence rate of cataract blindness including post surgical cases by best corrected visual acuity bcva 0 05 among middle aged and older chinese was 2 30 95 ci 1 72 3 07 and. Cataracts cause legal blindness in 10 3 percent of non hispanic whites 25 percent of african americans and 7 9 percent of hispanics who are legally blind.

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