Cataract Blindness Prevalence

Good visual outcome in the cataract operated eyes was 62 presenting and 75 2 best corrected.

Cataract blindness prevalence.

Blindness was more prevalent in the older age group and in women. Aao outlines the breakdown of legal blindness associated with eye disorders and diseases according to ethnic group. Cataract prevalence and magnitude. Sample size was calculated on the basis of estimating a blindness prevalence of 8 with an error bound precision of 15 with 95 confidence.

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. Cataract was the leading cause of blindness 79 4. 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. 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.

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. 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. Figure 1 below shows the estimated prevalence rate for cataract from the seven studies reviewed in this section.