12- IAPB Refractive Error Programme Committee. Strategy for the elimination of vision impairment from uncorrected refractive error. International Agency for the Prevention of Blindness, Hyderabad, 2008

12- IAPB Refractive Error Programme Committee. Strategy for the elimination of vision impairment from uncorrected refractive error. International Agency for the Prevention of Blindness, Hyderabad, 2008