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Review

Cataract Surgery

N Venkatesh Prajna, Thulasiraj D Ravilla, Sathish Srinivasan
Haile T Debas, Peter Donkor, Atul Gawande, Dean T Jamison, Margaret E Kruk, Charles N Mock
, editors.
In: Essential Surgery: Disease Control Priorities, Third Edition (Volume 1). Washington (DC): The International Bank for Reconstruction and Development / The World Bank; 2015 Apr 2. Chapter 11.
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Review

Cataract Surgery

N Venkatesh Prajna et al.
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Excerpt

The worldwide estimate of blindness (defined as best corrected visual acuity [BCVA] of 3/60 [recognizing at 3 meters what a person with normal acuity can recognize at 60 meters] and less in the better eye) is 39 million people (Pascolini and Mariotti 2012). This figure is just the tip of the iceberg; a significantly larger proportion of people suffer from low vision (defined as BCVA in the range of 6/18 to 3/60), which reduces their levels of independence, safety, and productivity (Thylefors and others 1995). The World Health Organization (WHO) has expanded the scope of the definition of blindness by using presenting visual acuity instead of BCVA. Table 11.1 provides a classification of severity of visual impairment as recommended by the International Council of Ophthalmology (2002) and the recommendations of the WHO (2003).

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