A new contact lens-based medicine delivery method changes color to confirm the drug has been delivered.
The prototype lens changes color without the need for dyes via a process called molecular imprinting, which relies on imprinting a material with cavities that match the shape of a chosen compound. To create the lens, a polymer material was embedded with cavities matching the shape of the glucose-treating drug timolol. As the timolol is released from the lens, the structure of the cavities changes and causes the lens to turn blue.
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