Updated March 05, 2015.

Definition: Retinoblastoma is cancer of the eye. It affects the retina, a thin membrane in the back of eye that works like a camera, making a picture of what we see. Some children have retinoblastoma that runs in families. It usually occurs in only one eye, but sometimes affects both eyes.

Occurs mostly in children younger than 5 years old.

^{adapted from the National Cancer Institute}