Abstract
The lamp employed is an Osram lamp, in which the volatilization of sodium ions on the walls of the tube produces an intense yellow light. Kleefeld employed it for the purpose of better visualizing the fundus of eyes with cloudy media and of observing lesions deep in the retina, the nearly monochromatic light achieving better penetration of the tissues than ordinary light. The author reports his findings with this light in various conditions in comparison with those by ordinary and red free light. The conditions covered in the report are retinal detachment, persistent medullated nerve fibers, macular degeneration, various stages of macular lesion, macular hole, hypertensive retinopathy, trauma to the retina and optic atrophy. The observations in these conditions are visualized by the illustrations, chiefly reproductions of fundus photographs. Many are examples of the author's "panoramic" fundus representation, in which a number of photographs are joined together so as to
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