Text-book of ophthalmology . ditions are very chronicand in both] detachment of the retina usually sets in later, followed by increase of ten-sion or irido-cyclitis and complete blindness. Exudative retinitis is rare and its causeunknown. It usually attacks young persons, and more frequently males, and commonlyaffects but one eye. ho ascribed it to haemorrhages in the outer layers of the retina, called it retinitis h&morrhagica externa.—D.] 13. Retinitis Circinata.—.Several forms, which are, to be sure, of rare occurrence,are distinguished by characteristic changes in the fundus from which the
Text-book of ophthalmology . ditions are very chronicand in both] detachment of the retina usually sets in later, followed by increase of ten-sion or irido-cyclitis and complete blindness. Exudative retinitis is rare and its causeunknown. It usually attacks young persons, and more frequently males, and commonlyaffects but one eye. ho ascribed it to haemorrhages in the outer layers of the retina, called it retinitis h&morrhagica externa.—D.] 13. Retinitis Circinata.—.Several forms, which are, to be sure, of rare occurrence,are distinguished by characteristic changes in the fundus from which they get theirnames—e. g., retinitis circinata from the circle of white spots. 14. Amaurotic Family Idiocy.—This very rare affection of the retina occurs inchildren in the first two years of life with the following symptoms: The region of themacula lutea is occupied by a grayish-white patch of the size of the papilla, having inits center a small vividly red spot like that found in embolism of the central artery. The. : . —: it: ;::- - - - - iht—f& The macula lutea and its vieinr; rmed into a yel Iowi=h-gTay. not sharply limited area wHch is enclosed by a zone composed of w:. r, to form map-like figures. On the side toward the papilla the spots are absent, so that the ring here is open. : the fundus Is normal, although the papilla becomes paler and paler all the timeand finally altogether atrophic. The changes are always found in both eyes, and arealike in both. The children gradually become blind, and exhibit apathy and paralyticweakness of the muscles. These symptoms increase until after the lapse of manymonths the children die. An! - changes in the cerebral cortex [and ganglion f the retina (Holden ) and descending degeneration in the spinal cord. The cause of the disease, which sometimes affects seven] children of thefamily, Is unknown. [The disease attacks particularly children of Jewish parentage.—D.] 523. Treatment.—The treatment mast be directed both against
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