The Nigerian national blindness and visual impairment survey: Rationale, objectives and detailed methodology

Table 2 Events calendar used to determine age of subjects in 2005

Event	Year	Present age if born in this year
Start of Second World War	1939	66
End of Second World War	1945	60
Queen of England visit to Nigeria	1957	48
Nigerian Independence	1960	45
Assassination of Premier of Northern Nigeria	1966	39
Nigerian Civil War started	1967	38
Change of money to Naira	1972	33
Assassination of General Murtala	1976	29
Change to Shagari civilian government	1979	26
Football World Cup	1994	11