Text-book of ophthalmology . essels{Magnus). F, Perivasculitis luetica (Magnus).—D.] DISEASES OF THE RETINA 579 In nephritis disturbance of vision may occur also under the form of a transitoryblindness without any retinitis being present. The patient declares that everythingsuddenly becomes dark before his eyes; the disturbance of sight increases so quicklythat the blindness gets to be complete within a few hours or a day. Even, however,when the blindness is absolute, the results of examination of the eye are usually nega-tive. After one or more days the sight is gradually restored. Simultaneo
Text-book of ophthalmology . essels{Magnus). F, Perivasculitis luetica (Magnus).—D.] DISEASES OF THE RETINA 579 In nephritis disturbance of vision may occur also under the form of a transitoryblindness without any retinitis being present. The patient declares that everythingsuddenly becomes dark before his eyes; the disturbance of sight increases so quicklythat the blindness gets to be complete within a few hours or a day. Even, however,when the blindness is absolute, the results of examination of the eye are usually nega-tive. After one or more days the sight is gradually restored. Simultaneously withthe attack of visual disturbance other nervous symptoms are found, such as head-ache, vomiting, dyspnoea, loss of consciousness, and convulsions—in short, the symp-toms of uraemia. The blindness is therefore known as urcemic amaurosis. The factthat the reaction of the pupil to light is in most cases preserved in spite of the com-plete blindness proves that the location of the affection cannot be in the eye or in. Fig. 252.—Retinitis Albuminurica. The clouding of the retiDa is most, pronounced in the region of the papilla, where it exhibits afine radial striation, and completely veils the margin of the nerve. Furthermore, even at a considerable-distance from the papilla, the retinal clouding covers isolated portions of the vessels and especiallythe distended veins, with a delicate haze, so that the vessels in these places look lighter. Surround-ing the papilla are found rounded, brilliantly white spots of exudation and numerous dark-red,radially striate haemorrhages. The latter lie mainly in the neighborhood of the larger retinal vessels,and in part cover them. From this fact and from their striate appearance, it can be inferred thatthey belong to the most anterior layer of the retina—the nerve-fiber layer. In the region of the mac-ula lutea is seen a group of small white specks, which combine to form the stellate figure characteris-tic of retinitis albuminurica
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