1. Pascolini D, Mariotti SP: Global estimates of visual impairment: 2010. Br J Ophthalmol. 2012, 96 (5): 614-618.
2. Foster A, Resnikoff S: The impact of Vision 2020 on global blindness. Eye (Lond). 2005, 19 (10): 1133-1135.
3. World Health Organization: WHA62.1. Action plan for the prevention of avoidable blindness and visual impairment 2009-2013. 2010, Geneva: WHO; WHO
4. Resnikoff S, Pascolini D, Etya’ale D, Kocur I, Pararajasegaram R, Pokharel GP, Mariotti SP: Global data on visual impairment in the year 2002. Bull World Health Organ. 2004, 82: 844-851.
5. du Toit R, Brian G: Mid-level cadre providing eye care in the context of Vision 2020. N Z Med J. 2009, 122 (1291): 77-88.