Calculate blood glucose content indirectly with calories and multiple parameters, and use multiple sensors to indirectly calculate blood glucose values. It takes two weeks for machine learning. <br />This smart contact lens should be called "ophthalmic electrochemical sensing technology", with a flexible electronic sensor and an antenna embedded. The sensor can read the chemical components in the patient's tears, and when the blood glucose is detected to a certain dangerous value, it will alert the patient through the built-in micro LED light. <br />It applied for US listing in 2014 and has not yet been listed.