Intraocular retinoblastoma is classified and staged to help doctors describe the degree of cancer in a child’s eye, determine best treatment options, define potential for cure / eye salvage, and compare impact of different therapies. Each eye is classified to define potential for safely saving the eye / vision. Stage of bilateral Rb is based on the worst affected eye, as an indicator of risk to the child’s life. When an eye might be classified into one of two groups, the higher risk group should be selected. This reduces risk of eye loss or life threatening relapse due to under-treatment.