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Although there are characters “L” and “R” on the top of the case for your contact lenses,however,you still can make mistakes when you are in a hurry or when it is quite dark around.With this design,you can easily recognize which side it is via the way openning it.That’s exactly convenient.
"R" stands for clockwise and "L" stands for anticlockwise,once you get the directions wrong,you won't open it.