If you've never heard of Retinoblastoma, please visit this facebook page that explains everything much better than I could:
Look at the photos on this page and then pay attention to the photos of children in your life and spread the word to others. These tumors show up in photos as a white reflection where you might normally see red-eye. In children with one healthy eye, the photo might show one red-eye and one white reflection. If caught early, the eye(s) can be saved. If ignored, the cancer can spread. Get the word out!