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Cookie case is a contact lenses case of purely physical structure.
It can remind the users of life span of different contact lenses, such as, monthly disposable, quarter disposable, half-yearly disposable and one-year disposable.
The bottom of the box is a dial. The dial is engraved with the corresponding time scale.
It takes from the compass in ancient china. And it can be adjusted to different angles according to different life span.
When the dial turns back to the original position, it means the contact lenses are out of date.