Global Vision Impairment Data 2015 - an overview Data correct as at 23rd Oct 2017 The number of visually impaired, the percentages for women and for those living in low and middle income countries, and the change in prevalence, all relate to distance-vision impairment. MSVI = the number with severe or moderate visual impairment. In order to enable comparisons over time, the age-standardised prevalence (all ages) is shown. An ultra-conservative definition of avoidable blindness is shown based upon the prevalence of Cataract, Refractive Error and Trachoma only. Other conditions are at least partially avoidable. The latest estimates for 2015 produced by the Vision Loss Expert Group and published in the Lancet © IAPB Vision Atlas
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