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In 1930, when Munch was 66 years old, an intraocular haemorrhage in his right eye affected his sight. For several months, with methodical precision, he attempted to render on paper what he saw through his affected eye as his condition changed. Inside the eye, the blood had coagulated into shapes, spots and smudges which were superimposed upon his normal vision. To him, some looked like birds, others like concentric circles. A professor of ophthalmology, who has studied the artist’s works and his eye condition, explores how the sketches and watercolours of these 'visions' reflect a remarkable period of Munch’s output late in life