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• Use “ “ for phrases o [ “pediatric abdominal pain” ] • Use – to remove results with certain terms o [ “abdominal pain” –pediatric ] • Use OR to account for alternate terms o [teenager OR adolescent ]
左右眼的神经信号分别沿相应的视神经纤维传导。两个视神经在视交叉处汇合。来自一眼的视神经纤维一半交叉到对侧,一半在同侧向大脑延伸。由于这种解剖关系,大脑都可以接收来自左右两侧视野的信息。眼部或视路受损的部位不同,视野缺损的类型也各有差异。