👉 Retroid, also known as a retinoblastoma tumor, is a type of cancer that affects the retina, which is the layer of light-sensitive nerve cells in the eye. It primarily occurs in children and adolescents, but it can affect adults too. The symptoms of retroid include vision problems, such as double vision or difficulty seeing colors, as well as fatigue, tremors, and muscle weakness. Treatment for retroid typically involves chemotherapy to help manage the cancer and improve vision.