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4:41
人眼睛结构你知多少? 人眼是一个复杂而精密的感觉器官,它允许我们感知和理解外部世界。以下是人眼的主要结构和功能的重点: 1. 角膜 (Cornea):角膜是眼睛外部可见的透明膜,它是光线进入眼睛的第一个折射点,起到聚焦光线的作用。 2. 晶状体 (Lens):晶状体位于眼球内部,它是一个透明的凸透镜,可以通过改变其形状来调节光线的折射,帮助眼睛对不同距离的物体进行对焦。 3. 虹膜 (Iris):虹膜是眼睛的有色部分,它通过扩大或收缩瞳孔的大小来控制进入眼睛的光线量。 4. 瞳孔 (Pupil):瞳孔是虹膜中的圆孔,通过它光线进入眼球。在弱光下,瞳孔会扩大以允许更多光线进入,而在强光下则会收缩。 5. 视网膜 (Retina):视网膜是眼球内部的光敏组织,它包含了视杆细胞和视锥细胞,负责感知光线和转换成神经信号,以便传输到大脑。 6. 玻璃体 (Vitreous Humor):玻璃体是填充眼球内部的透明胶状物质,它帮助维持眼球的形状并支持视网膜。 7. 脉络膜 (Choroid):脉络膜是位于视网膜下方的血管丰富的组织,它提供营养和氧气给视网膜,并控制瞳孔的大小。 8. 视神经 (Op
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Sep 12, 2023
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