Blindness can be easily explained, is a lack or loss of vision. Blindness is a medical condition in which individuals lack the ability, optical properties functions under a variety of physiological or neurological factors. According to the World Health Organization (WHO), more than 200 million people (about 3 percent of world population) visually impaired people in the world. In the United States, this figure stands at an incredible 2.5 million, which is reported to lawblind.
Why do people suffer from blindness? There are several reasons attributed occurs blindness or loss of vision in the eye. Some of the causes of blindness are explained below:
1. Diseases: These are the most common cause of blindness. There are a variety of diseases that lead to blindness. Popular in these glaucoma, trachoma, cataract, uveitis and diabetic retinopathy. While in some cases, blindness occurs as a result of a parasitic infection of the eye, in others there isas a result of malnutrition. Blindness due to vitamin A deficiency is common in most developing and underdeveloped countries.
2. Injury: This is another major cause of monocular blindness. Accidents and injuries are caused, either directly to the eye or the occipital lobes of the brain lead to blindness.
3. And Abnormalities Genetic Diseases: Congenital defects and mutations in the genes may also lead to blindness. Some popular examples of such conditionsinclude optic nerve hypoplasia, albinism, Bardet-Biedl syndrome and Leber congenital amaurosis.
4. Poisoning: Intake of certain chemicals can also cause blindness. The documented example is the use of methanol, which is found in alcohol. This is consumed by individuals as an alternative to alcohol regularly. Blindness occurs as a result of the use of drugs, aimed at a different disease to heal in the body.
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