Retinoblastoma is a cancer of the retina, the innermost layer of the eye that receives the light and images necessary for vision. About 300 children are diagnosed with retinoblastoma each year, making it the most common eye cancer in children under the age of 5. Every year, thousands of babies and children in low- and middle-income countries lose their sight and their lives to a treatable childhood eye cancer called retinoblastoma; usually because it was not recognized and treated in time. 
