Retinoblastoma is commonly known as eye cancer. When a retinal tumour (tumour in the light sensitive part of retina) turns malignant, it leads to eye cancer. Retinoblastoma normally affects children within 5 years of age but in rare circumstances, adults may also get affected. It is commonly caused due to genetic mutation of the nerve cells. Mutation sets in an abnormal growth pattern in the healthy cells of eyes by preventing their normal growth and function. These cells accumulate in the retina as cancerous tissue mass. They can also invade other parts of the eyes, the brain and the spinal cord.