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Question category: Ophthalmology

A 34 year old man with diabetes presents with painless loss of vision in his right eye when woke up that morning. He has a 12 year history of diabetes and 5 year history of controlled hypertension. With his right eye he can only distinguish light from dark. Pupil reactions are normal. Fundoscopy shows boat shaped pre-retinal haemorrhage, neovascularisation near the optic disk, cotton wool spots and microaneurysms. What has caused the sight loss?

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