1. One of the photoreceptors in the retina of the eye that is responsible for daylight and color vision. These photoreceptors are most densely concentrated in the fovea centralis, creating the area of greatest visual acuity. 
   视锥细胞一种在视网膜上感受光线和色彩的感光细胞。这些感光细胞主要集中于视网膜的中央凹进处，使得这一部分对光线最敏感
2. A unit of retinal illumination, equal to the amount of light that reaches the retina through1 square millimeter of pupil area from a surface having a brightness of1 candela per square meter. 
   光度视网膜亮度单位，相当于每平方米有一烛光亮度的表面，通过一平方毫米的瞳孔区域，到达视网膜的光线数量
3. The plexiform layers of the retina. 
   视网膜丛状的层
4. A visual organ; visual receptors on the retina. 
   视觉器官；视网膜上的视觉感受器
5. inflammation of the choroid layer behind the retina. 
   视网膜后的脉络膜层发炎。

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