人眼结构 锥状细胞Cones rods 数目：600~700万，位于中心凹附近 每个锥状细胞连接到单独一个双极性 细胞 空间分辨率高，对颜色敏感度高 感光灵敏度低，锥状视觉称为“明视觉' 」杆状细胞Rods cones 数目：7500万~1.5亿 几个杆状细胞连接到同一个双极性细 胞 空间分辨率低，没有色彩感觉 感光灵敏度高，杆状视觉称为“暗视觉 第章第页
Light Adaptation亮度适应
Dark Adaptation Function hi the cones are more sensitive here ....cones rod-cone the rods are break more sensitive here lo rods 0 5 10 15 2025 30 Time in dark (minutes) For approximately the first 10 minutes in the dark,the cones require less light to reach a threshold response than do the rods.Thereafter,the rods require less light. The point at which the rods become more sensitive is called the rod-cone break
人眼结构 视网膜上锥状细胞和杆状细胞分布密度 Human人类 180.000 Blind spot -Cones 感光细胞 双极细 ---Rods 135.000 睫状肌 90.000 ·晶状体 一虹膜 45.000 神经 视神经 纤维 80 60 40 20 0 20° 40 60 80 盲点 Degreks from visual axis (center of fovea) Cone vision (bright-light vision) Rod vision (dam-light vision) 空间上的离散化 第章第列
人眼结构 Right and left monocular crescents B 双眼视野 视野的边界 右半球←→左半球 盲点 Source:John H.Martin: anat ttp://n my Textand Atlas,Fourth Edition, oyright McGraw-Hill Education.All rights reser 东华君（知乎）修改