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A new study has revealed that the proportion of vision impairment and blindness worldwide that is caused by cataract and macular degeneration varies geographically. The findings are published in The Lancet Global Health.
The team of researchers, led by Rupert Bourne of the Vision and Eye Research Unit at Anglia Ruskin University, say their study is the largest ever analysis of worldwide vision impairment and blindness.
To reach their findings, they analyzed geographical trends of the disabling conditions between 1990 and 2010, alongside their main causes.
The investigators used published and unpublished data to reach their findings, and say they defined blindness as "visual acuity in the better eye less than 3/60" and moderate and severe vision impairment (MSVI) as "visual acuity in the better eye less than 6/18 but at least 3/60."
The investigators looked specifically at cataract, glaucoma,macular degeneration, diabetic retinopathy, trachoma and uncorrected refractive error, and estimated how these conditions contributed to visual impairments in proportion to age, geographical region and year.
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