Blindness: Causes and Global Data of Blindness

Loss of total sight in both of the eyes is strictly defined as state of being blind. About 285 million people are visually impaired (Cannot see clear with even spectacles) out of which 39 millions are totally blind.

Blindness: Causes and Global Data of Blindness

Blindness

Loss of total sight in both of the eyes is strictly defined as state of being blind. About 285 million people are visually impaired (Cannot see clear with even spectacles) out of which 
39 millions are totally blind. 82 % of the People who are aged 50 and above are blind. Some of the causes as told by eyehealthnepal.com are as below:

CataractCataract also called the leading cause of blindness in the world till today, has been the demon killing the eyes of people regardless of age. 51% of the total blindness is due to cataract. Developing countries and under developed countries are mostly affected by this eye disease. Opacity in the natural crystalline lens of human is termed as cataract. The opacity prevents the light to reach retina thus a person becomes temporarily blind. If not treated, the person can go blind permanently. The only treatment means invented so far is surgery. The opacified lens is removed with an artificial crystalline lens made of glass. The person will be able to see clearly again after the surgery is done. Nepalese doctor Sanduk Ruit has simplified the surgical technique so that it can be made accessible to the remote and poor community. Prevention from Ultraviolet rays of light must be done to prevent cataract. About 20 million people are blind due to cataract.

GlaucomaGlaucoma remains the second leading cause of blindness in the world. About 8% of total blindness has happened due to glaucoma. Glaucoma is a disease of optic nerve of the eye. An irreversible damage to the optic nerve happens in glaucoma. The pressure inside the eye ball plays a big role in causing glaucoma.

Childhood blindness: Total number of children suffering from blindness in the world is estimated to be 1.4 million and 75% of which live in Africa and Asia. 4% blindness in the world is caused by childhood blindness cases. Blindness due to genetic mutation, birth defects, premature birth, Nutritional deficiencies, infections, injuries, refractive errors, Retinopathy of Prematurity (ROP) etc. falls under the category of childhood blindness

Age related Macular degeneration: 5% of the global cause of blindness is due to this eye disease. Healthy food can prevent the progression of this eye disease that affects only adults.

Corneal Opacity: 4% of the total blindness is due to opacity in frontal structure of the eye ball also called as cornea. Injury to eye, Vitamin A deficiency, or a disease called trachoma cause to happen opacity in the cornea.

Refractive error: Refractive error means the blurry vision caused by change in refractive power of the eye ball. The light coming to eye is not bent properly to the retina. The image cannot be formed in the retina. 3% of blindness is caused by refractive error. Schooling children are affected as the eye becomes lazy (amblyopic) if glasses are not worn in the right time.

Diabetic retinopathy: Due to high glucose level in the blood, the protein in the blood reacts with the sugar. This cause the blood vessels to swell and erupt. The ruptured blood vessels brings the lipid along with blood. The retinal vessels are affected in such a manner. This situation is called diabetic retinopathy. 1% of total blindness is caused by D.R. It is estimated that 422 million adults are diabetic in the whole world and are in the high risk of getting blind.

21% of the total blindness is still undetermined for the cause, according to the latest report blindness prevalence by world health organization. 

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Lumbini Media - Nepali News and Entertainment Portal, Daily Nepali News Updates From Lumbini, Nepal: Blindness: Causes and Global Data of Blindness
Blindness: Causes and Global Data of Blindness
Loss of total sight in both of the eyes is strictly defined as state of being blind. About 285 million people are visually impaired (Cannot see clear with even spectacles) out of which 39 millions are totally blind.
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