Retinitis pigmentosa (RP) is a group of rare eye diseases that affect the retina (the light-sensitive layer of tissue in the back of the eye). RP makes cells in the retina break down slowly over time, causing vision loss. RP is a genetic disease that people are born with.
Retinoblastoma is a cancer that starts in the retina, the very back part of the eye. It is the most common type of eye cancer in children. Rarely, children can have other kinds of eye cancer, such as medulloepithelioma, or ocular (eye) melanoma.
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Usher syndrome is a rare genetic disease that affects both hearing and vision. It causes deafness or hearing loss and an eye disease called retinitis pigmentosa (RP). Sometimes, it also causes problems with balance.