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Health & Medicine for Senior Citizens

Macular Degeneration Now Leading Cause of Blindness in Rich Nations; Poor Vision Drops

Macular degeneration has become leading cause of blindness in rich countries as rates of blindness in developed world improve dramatically in 20 years

March 26, 2014 Rates of blindness and impaired eyesight have plummeted over the past 20 years in the developed world. But the bad news especially for senior citizens and women is that macular degeneration has replaced cataract as the leading cause of blindness in wealthy countries, where women were more likely to be blind or to have poor vision than men in all years studied.

The researchers trawled through the available evidence from 1980 to 2012 on the prevalence and causes of blindness and partial sightedness/impaired vision in high income countries - Asia Pacific; Australasia; North America; and Western Europe - and Central and Eastern Europe.

They found 243 suitable studies out of a total of 15,000 worldwide that were representative of many populations, according to a report published online in the British Journal of Ophthalmology.

 

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They then used statistical methods to calculate estimates of the prevalence and most common causes of blindness and impaired vision/partial sightedness between 1990 and 2010 for all 190 countries.

Over the 20 year period, the prevalence of blindness halved in high income countries, falling from 3.314 million people (0.2% of the population) to 2.736 million people (0.1% of the population).

What is Macular Degeneration?

Macular degeneration, or age-related macular degeneration (AMD), is a leading cause of vision loss in Americans 60 and older. It is a disease that destroys your sharp, central vision. You need central vision to see objects clearly and to do tasks such as reading and driving.

AMD affects the macula, the part of the eye that allows you to see fine detail. It does not hurt, but it causes cells in the macula to die. There are two types: wet and dry. Wet AMD happens when abnormal blood vessels grow under the macula. These new blood vessels often leak blood and fluid. Wet AMD damages the macula quickly. Blurred vision is a common early symptom. Dry AMD happens when the light-sensitive cells in the macula slowly break down. Your gradually lose your central vision. A common early symptom is that straight lines appear crooked.

Regular comprehensive eye exams can detect macular degeneration before the disease causes vision loss. Treatment can slow vision loss. It does not restore vision.

NIH: National Eye Institute

Similarly, the prevalence of partial sightedness/impaired vision dropped by 38%, falling from 25.362 million (1.6% of the population) to 22.176 million people (1% of the population).

Globally, the prevalence of blindness and partial sightedness/impaired vision also fell during this period - by 37% and 27%, respectively.

In high income countries, women were more likely to be blind or to have poor vision than men, throughout the 20 year period.

The most common cause of blindness changed during this time from cataract (clouding of the lens) to macular degeneration (degenerative condition affecting central vision) - except in eastern and central European countries.

But the most common cause of partial sightedness/impaired vision - uncorrected refractive error (including long and short sightedness) - remained the same.

"[This] shows that even for the highly developed countries one of the most effective, cheapest, and safest ways of improving vision loss by providing adequate spectacles for correcting refractive errors, is being overlooked," the authors point out.

And they warn that the surge in the prevalence of diabetes will have an enormous impact on eye health, with upwards of 100 million people expected to develop diabetic retinopathy, around a third of whom risk losing their sight. Many people with diabetes will also be at risk of glaucoma and cataract, they add.

"Strategies to screen for diabetic retinopathy and provide timely treatment access are critical to prevent this condition from having a greater impact on blindness prevalence in the future," they write.

>> BMJ-British Medical Journal

 

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