Data World Health Organization (WHO) 2011 says there are currently 285 million people suffer from vision disorders, 39 million of them are blind. As many as 90 percent of patients in developing countries.
Health research data in 2007 showed the proportion of low vision to people aged 6 years and over 4.8 percent, while the proportion of blindness of 0.9 percent.
Cataracts are the leading cause of blindness or 50 percent in developing countries. Cataract is one of the major health problems in the elderly.
"Blindness due to cataract can actually be overcome by performing cataract surgery,".
other causes of blindness and visual impairment was refractive disorders with a prevalence of 22.1 percent of the total population and 15 percent of them suffered by school-age children.
Refractive disorders can be found in all age groups, but this condition should be considered in children of school age. "Meanwhile, another visual impairment issues that can lead to blindness are glaucoma or increased pressure within the eyeball, and xeroftalmia the disease due to lack of vitamin A,".
