http://core.ac.uk/download/pdf/13099634.pdf
core.ac.uk
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http://www.researchgate.net/profile/Muhammad_Jadoon2/publication/23246031_Visual_Function_and_Quality_of_Life_Among_Visually_Impaired_and_Cataract_Operated_Adults_The_Pakistan_National_Blindness_and_Visual_Impairment_Survey/links/0deec53a15e40f18a2000000/Visual-Function-and-Quality-of-Life-Among-Visually-Impaired-and-Cataract-Operated-Adults-The-Pakistan-National-Blindness-and-Visual-Impairment-Survey.pdf
ResearchGate
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http://www.onacademic.com/detail/journal_1000037546878610_384b.html
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