1. Early detection of visual impairment and its relation to academic performance;Toledo;Rev Assoc Med Bras,2010
2. Economic costs associated with mental retardation, cerebral palsy, hearing loss, and vision impairment—United States, 2003;MMWR Morb Mortal Wkly Rep,2004
3. Global estimates of visual impairment: 2010;Pascolini;Br J Ophthalmol,2012
4. Blindness and visual impairment. Fact sheet number 282. Updated August, 2014,2014
5. The prevalence and pattern of visual impairment and blindness among Primary School pupils in Kitale Municipality, Kenya;Barasa;JOECSA,2013