经过暗适应的晶体柱可以对不同物距的目标形成清晰的正重叠像，像的大小随物距的增大而减小；
A real optical superposition image was formed by dark-adapted crystalline cones for an object at different distances and its size decreased as the object distance increased.
经过暗适应的晶体柱可以对不同物距的目标形成清晰的正重叠像，像的大小随物距的增大而减小；
A real optical superposition image was formed by dark-adapted crystalline cones for an object at different distances and its size decreased as the object distance increased.
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