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；
2
Once you are darkadapted, there is another little trick that can help you pick up even fainter objects and it relies on the structure of the retina.
如果适应了黑暗，这里还有一个小窍门让你看到更加微小的事物。这就要倚靠视网膜组织了。
3
This is called "dark adaptation" and it takes your eye up to an hour to become fully adapted to seeing in low light conditions.