The WHO estimates that in 2012 there were 285 million<unk> ly impaired people in the world, of which 246 million had low vision and 39 million were blind. Of those who are blind 90% live in the developing world. Worldwide for each blind person, an average of 3.4 people have low vision, with country and regional variation ranging from 2.4 to 5.5. By age:<unk>  is unequally distributed across age groups. More than 82% of all people who are blind are 50 years of age and older, although they represent only 19% of the world's population. Due to the expected number of years lived in blindness (blind years), childhood blindness remains a significant problem, with an estimated 1.4 million blind children below age 15. By gender: Available studies consistently indicate that in every region of the world, and at all ages, females have a significantly higher risk of being<unk> ly impaired than males. By geography:<unk>  is not distributed uniformly throughout the world. More than 90% of the world's<unk> ly impaired live in developing countries. Since the estimates of the 1990s, new data based on the 2002 global population show a reduction in the number of people who are blind or<unk> ly impaired, and those who are blind from the effects of infectious diseases, but an increase in the number of people who are blind from conditions related to longer life spans. In 1987, it was estimated that 598,000 people in the United States met the legal definition of blindness. Of this number, 58% were over the age of 65. In 1994–1995, 1.3 million Americans reported legal blindness.
Visual impairment
Dyslexia
Vision disorder
Sexual dysfunction
Cognitive disorder
Cognitive deficit
Cortical blindness
Color blindness