%0 Journal Article %B BMC Ophthalmology %D 2011 %G eng %M 21910894 %P 25 %T inVestIgating the pSychologIcal and ecONomic impAct of cataRact surgerY in Vietnam: The VISIONARY observational study protocol %V 11 %7 2011/10/04 %@ 1471-2415 (Electronic)1471-2415 (Linking)