在甲壳动物和昆虫的小眼中，通常都含有8 个小网膜细胞（Retinular cell）和 4 个视锥细胞（Cone cell），这也是被认为两者复眼同源的证据之一。
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它们的视网膜细胞对中等亮度光线中的红色成分也不太敏感。
Their retinal cells are also not excessively sensitive to red components of moderately bright light.
他们接受了视网膜细胞附近的基因注射，以帮助修补他们的光受体。
They received a shot of genes near their retinal cells to repair their light receptors.
进一步的分析表明，只有物体靠近时，这种视网膜细胞才会被激活。
Further analysis of this one kind of retinal cell revealed that it fired only when an object approached.
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