<unk>  is damage to retina due to exposure to ionizing<unk> .<unk>  has a delayed onset, typically after months or years of<unk> , and is slowly progressive. In general,<unk>  is seen around 18 months after treatment with external-beam<unk>  and with brachytherapy. The time of onset of<unk>  is between 6 months to 3 years. An exposure to doses of 30-35 grays (Gy) or more is usually required to induce clinical symptoms, however, retinopathy may develop after as little as 15 Gy of external-beam<unk> . A reported safe dose is : per week in five fractions of .
Radiation retinopathy
Diabetic retinopathy
Autoimmune retinopathy
Toxic and nutritional optic neuropathy
Hypertensive retinopathy
Photic retinopathy
Autoimmune optic neuropathy
Diabetic papillopathy