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微生物人的眼睛一般都看不到，那么昆虫可以看得到吗？一只动物的眼睛能看到多小的物体，取决于眼睛的分辨率，并不取决于眼睛的大小。而分辨率是由视网膜上的细胞数量和分布和决定的。昆虫的复眼里是都是小眼组成的，每个小眼相当于一个像素点，苍蝇最多就4000个小眼，其他蝴蝶、飞蛾大概也就28000个复眼。这些像素点构成的分辨率并不高，所以昆虫看到的世界都是马赛克的世界。细菌一般来说直径在0.5-5μm左右，人的肉眼是看不到的，更别说分辨率极低的昆虫复眼了。但有一种细菌，名叫纳米比亚嗜硫珠菌，它的直径可达半毫米，人类的肉眼可以轻松看到，有近视的可以戴上眼镜也一样可以看到（下图左上角）。假如一只昆虫离这种体积超大的细菌距离足够近，那么它肯定可以看到。
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