The Demography of Visual Disorders

Карта проблем с видениями в даль, видимо, близорукостью, гря парусьге
Map showing the degree of any difficulty with far vision.
Darker colors indicate a greater degree of any degree of far visual difficulty. Countries in white did not participate in the World Health Survey.
из статейки:
Freeman EE, Roy-Gagnon M-H, Samson E, Haddad S, Aubin M-J, et al. (2013)

The Global Burden of Visual Difficulty in Low, Middle, and High Income Countries. 

PLoS ONE 8(5): e63315. doi:10.1371/journal.pone.0063315