@incollection{,
	
					
					
					4C384E58C45D261F6546DB8C93595BF7
				,
	author={{SamanWimalasundera} and {Faculty of Medicine, University of Ruhuna, Sri Lanka}},
	journal={{Global Journal of Medical Research}},
	journal={{GJMR}}2249-46180975-588810.34257/GJMR,
	address={Cambridge, United States},
	publisher={Global Journals Organisation}151914
}

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	title={{The refractive errors in children. The paediatric clinics of north Americavol}}
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	year={December 1987}
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			Pavan -LangstonDeborah
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	title={{Manual of ocular diagnoses and therapy Asian edition}}
				
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	year={1985}
			
		
	

}

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	title={{Gary Heiting or www}}
		
	
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	note={allabout vision.com}

}

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	title={{) the eye in general practice}}
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	author={{
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	year={1985}
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	address={Edinburgh, London cherchil Livingstone}
		
	
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	note={th ed}

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@incollection{b5,
	
	
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	title={{visual impairement in school children in southern}}
		,
	author={{
			VKalkivayi
		} and {
			TJNaduvisath
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	journal={{India Indian J. ophthalmology}}
		
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	year={1997}
		
	

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	title={{refractive error and ethnicity in children}}
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	author={{
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	journal={{Arch. Ophthalmology}}
		
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	year={2003}
		
	

}

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	title={{Global magnitude of visual impairement caused by uncorrected refractive errors in 2004}}
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	author={{
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	title={{the distribution of refractive errors in Sri Lankan children. The journal of the college of ophthalmologists of Sri Lanka}}
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	year={2005}
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@book{b9,
	
	
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	title={{Draft action plan for the prevention of avoidable blindness and visual impairement}}
		
		
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	year={2013. 2014. 2019}
		
	

}