Text-book of ophthalmology . OF OPHTHALMOLOGY velop as a result of injuries affecting the whole eyeball, such as contusions, the entry offoreign bodies into the vitreous, etc., so that the macula must be regarded as a particu-larly vulnerable spot in the background of the eye. Finally, there is observed in oldpeople a disease of the macula which usually affects both eyes about equally, and isreferable to senile changes. [This causes marked impairment of sight, especially fornear work, even when but little change is discoverable by the ophthalmoscope.—D.] 2. Chorioiditis disseminata is characte
Text-book of ophthalmology . OF OPHTHALMOLOGY velop as a result of injuries affecting the whole eyeball, such as contusions, the entry offoreign bodies into the vitreous, etc., so that the macula must be regarded as a particu-larly vulnerable spot in the background of the eye. Finally, there is observed in oldpeople a disease of the macula which usually affects both eyes about equally, and isreferable to senile changes. [This causes marked impairment of sight, especially fornear work, even when but little change is discoverable by the ophthalmoscope.—D.] 2. Chorioiditis disseminata is characterized by numerous round or irregular spotswhich are scattered over the fundus (Figs. 197, 199). This is an eminently chronicvariety, in which, in the course of time, new spots are being constantly formed. Oftenthis takes place discontinuously; i. e., after a long interval suddenly a number of newfoci develop, as if the morbific agent had been carried by the blood-current to differentparts of the chorioid at the same Fig. 199.—Chorioiditis Disseminata. (After De Wecker.)That the chorioiditis has attacked a myopic eye can be recognized from the atrophic crescentwhich incloses the papilla upon the temporal side. The crescent is sharply defined by the scleral ringon the side next to the papilla, and by the pigment ring on its temporal side, and shows everywhereremains of the chorioidal vessels and also of pigment. The chorioiditic foci occupy chiefly the equa-torial parts of the fundus. They are white, with a lining of pigment of greater or less width; manyalso have spots of pigment in their interior. The retinal vessels are perfectly distinct as they passacross the spots and their pigment—i. e., they lie in front of the latter. In old cases, the chorioid is studded all over with spots, which in many placesbecome confluent, so that the fundus looks spotted for a large part of its extent. Thesight may, nevertheless, still be pretty good, if only the region of the macula
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