Retinoblastoma is a cancer that forms in the retina, a layer of tissue in the eye that’s sensitive to light. It’s a rare eye cancer, but it’s the most common cancer that starts in the eye in children. It’s typically diagnosed in children under age 2.

We spoke with ophthalmologist and retinoblastoma specialist Dan Gombos, M.D., to learn more about retinoblastoma, including symptoms, how it’s diagnosed and how it’s treated.