局灶性坏死性视网膜炎,是眼部弓形体病特征性病变。在急性或急性炎症期,表现为黄白色棉絮样斑块。可以象视乳头大或稍大一些的弧立病灶更象棉絮,软而边界不清,较陈旧的则带白灰色,边界清楚,并有脉络膜色素的聚集。从急性病灶表面脱落的炎症渗出往往浓厚,使眼底看不清,只见黄色背景上有一白色团。在这种病例,后玻璃体膜常有脱离,并有相当于角膜后沉着物的炎症细胞,沉着在玻璃体后面。沿着视网膜动脉及静脉有炎症细胞环绕。急性炎症病灶位于黄斑上方时,均会有黄斑水肿。在亚急性炎症,黄斑及绕视乳头处亦常见视网膜水肿。这种水肿常为视力减退的主要原因。视神经受害可为原发或继发,有作者曾描述视神经本身弓形体病。有些作者认为视神经为弓形体侵入视网膜的途经。有人将活的弓形体注入 Focal necrotizing retinitis is a characteristic lesion of the toxoplasmosis of the eye. In acute or acute inflammation, the performance of the yellow-white cotton-like plaque. Can be like the optic nerve larger or slightly larger focal lesions arc more like cotton, soft and unclear boundaries, older with white gray, clear boundaries, and choroidal pigment aggregation. Inflammatory exudation from the surface of acute lesions often thick, so that the fundus can not see, I saw a white background on a yellow regiment. In this case, the posterior vitreous membrane is often detached, with inflammatory cells that are equivalent to posterior corneal semitranspulmonary deposits behind the vitreous. Along the retinal artery and vein surrounded by inflammatory cells. Acute inflammation lesions are located above the macula, there will be macular edema. In subacute inflammation, macular and around the nipple also common retinal edema. This edema is often the main reason for vision loss. Optic nerve damage can be primary or secondary, and the authors have described the optic nerve itself, toxoplasmosis. Some authors consider the optic nerve to be a pathogen for the toxo invade the retina. Someone injects a living toxo