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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, which is described briefly below, or melanoma.hey usually cause eye pain and loss of vision. The diagnosis is made when a doctor finds a tumor mass in the eye by using an ophthalmoscope (an instrument that helps doctors to look inside the eye). Like retinoblastoma, the diagnosis is usually made based on where the tumor is inside the eye and how it looks.
Retina: Photosensitive lining inside the eye. Rods: Light-sensitive nerve cells of the retina that function chiefly in dim light. Sclera: Tough, fibrous outer covering (the white) of the eyeball. Vitreous humor: Clear, gel-like substance inside the large cavity in back of the lens (the center of the eyeball).queous humor: Clear liquid filling the small cavities between the cornea and the iris and between the iris and the lens. Astigmatism: Vision disorder caused by an uneven curvature in the cornea (sometimes the lens), resulting in indistinct or slightly out-of-focus images.