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Automatic optical zoom.It is different with the glasses now.Now the glasses are fixed focal length.However, it is the people's attention and can automatically change focus to the object of focus for human observation.Viewing distance, it can zoom into the telescope, so you can see kilometers away objects.See near, it can zoom into a magnifying glass, so you can see the body in the hands of bacteria.Gives us a new understanding of the surrounding environment.
Guangdong College Of Industry