除偶见之睫状视网膜动脉外,视网膜全由视网膜中心动脉供血。然而视网膜血管的行径与分布有着广泛的个体差异,甚至同一人两眼也不一致。视网膜动脉枝三叉分枝及相似血管呈现交叉者极罕见。作者观察了身体及眼部无异常者2100例,见视网膜动脉的异常如下: 一、分枝异常:视网膜动脉作三分叉者14眼,其中11眼三分叉见于视乳头或其近处,其余3眼远离视乳头。视乳头内2枝动脉皆三分叉者1眼。动脉与伴行静脉皆分三叉者1眼;另1眼有动脉三分叉之一枝与另枝相交。一般谓三叉枝呈直角走行,而本组中呈直角者仅3眼,多数者呈锐角走行。视网膜动脉三分叉者并不象有人(Primrose)说的那么少见。但同时兼有动脉交叉和伴行静脉也分三叉者则罕见。二、行径异常:颞下视网膜由颞上动脉之一大支供应者11眼,与此情况相反的有8眼。鼻上动脉沿视乳头鼻侧缘弯曲走向鼻下视网膜者5眼。当此种异常走行动脉闭塞后,可出现与常理不一致的视野缺损。三、异常性小动脉—动脉交叉:鼻侧象限动 In addition to occasional ciliary retinal artery, the retina by the central retinal artery. However, the behavior and distribution of retinal blood vessels have a wide range of individual differences, and even the same person two are not the same. Retinal artery branches trigeminal branches and similar vascular presentation of cross-rare. The author observed no abnormalities in the body and eyes of 2,100 cases, see the retinal artery abnormalities are as follows: First, the branch abnormalities: the retinal artery for the three fork in 14 eyes, of which 11 eyes were bifurcated in the optic nerve or in the vicinity, The remaining 3 eyes away from the optic disc. The optic nerve in the two arteries are three fork one person. Arteries and accompanying veins are divided into three trigeminal one eye; the other one with three branches of arteries and branches intersect. Generally speaking, tripod branches at right angles to the line, while the group was only 3 at right angles, most of them were walking at acute angles. Retinal artery trifurcation is not as uncommon as some people (Primrose) say. But at the same time, both the arterial cross and accompanying vein are also three-pronged are rare. Second, the abnormalities: the infratemporal retina by the superior branch of the superior arteries in the supply of 11, in contrast with the 8 eyes. Nasal artery along the lateral edge of the nasal optician bend to the retina 5 under the eyes. When such abnormal artery occlusion, there may be inconsistent with the common sense of visual field defects. Third, abnormal small artery - artery cross: nasal quadrant movements