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Kugelberg has exhausted the study of the possible investigative methods with the instrument available in a review of the conditions found in the normal fundus with monochromatic light. His monochromatic apparatus consists of an Abbe prism of constant diversion which outlines a spectrum by means of the illuminous slit from an arc light which is intersected by a second slit providing a desired wavelength. By turning the prism one obtains successive wavelengths, which on account of the fluctuating dispersion and intensity may be corrected by the change in size of the slit. The apparatus is checked for measurement of wavelength by means of a linear spectrum and thereby the consistency of the monochromatic nature of the wave is assured. The pamphlet is divided into ten chapters, on (1) introductory matter and survey, (2) method, (3) survey of the normal background of the eye in monochromatic light, (4) the retinal arteries,
Ophthalmoskopische Studien in monochromatischem, sukzessiv veränderlichem Licht. I. Der normale Augenhintergrund. JAMA. 1938;111(8):747. doi:10.1001/jama.1938.02790340083038
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