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The author, who is a cardiologist, has systematically been making an examination of the fundus in all his patients and has taken many photographs of the fundus in black and white with the Nordenson camera. He has collected 232 plates for this study of hypertension and cyanosis, As pictures of the fundus usually show the advanced or rather the terminal, stage the author has studied particularly the preceding conditions, which are more difficult to recognize, and attempts to show how the smallest vessels are affected in hypertensive conditions. The photographs have not been retouched, and each photograph is accompanied with a concise and exact commentary on the general and fundus conditions. The photographs on the whole are successful, although in some the absence of color is noticeable. An accompanying text discusses the changes in turn and, with the illustrations, explains each condition from a physiopathologic standpoint.
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Knapp A. Le fond d'oeil des hypertendus et des cyanoses.. Arch Ophthalmol. 1949;41(5):654. doi:10.1001/archopht.1949.00900040670017