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When we buy new eye-glasses need to adjust the lens repeatedly, to understand the radian of the lens, this process needs to be repeated to remove the lens and then put on the proper curvature of the lens, that is very inconvenient.
This design uses the water extrusion expansion principle of the Hydration through water bag extruded principle, water will form the curvature of the meniscus lens expansion, while the position of the pressing pressure is converted into a degree of curvature can be glasses need to measure only, greatly reduces changing lenses trouble.
National Cheng Kung University
I Jui Lee