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The font sizes of the article notes or drug description are not identical but the magnification of a magnifying glass is fixed. Water Reading Glass is a magnifying glass that contains a len and handle and it is connected together by a capsule with water. When using it (holding the handle without squeezing), the len has a fixed magnification. And when there is a need to increase the magnification, just need to gently force grip the handle, the water in the handle will flow to the len and make the curvature larger, thus temporarily increase the magnification in order to read smaller text.
Su Yang, Duochun She, Hailing Zhong, Jiang Wu