A GAME-CHANGER FOR PEOPLE WITH DIABETES IF THIS PANS OUT: Apple hits ‘major milestones’ in moonshot to bring noninvasive blood glucose monitoring to Apple Watch. “Apple is taking a different approach, using a chip technology known as silicon photonics and a measurement process called optical absorption spectroscopy. The system uses lasers to emit specific wavelengths of light into an area below the skin where there is interstitial fluid — substances that leak out of capillaries — that can be absorbed by glucose. The light is then reflected back to the sensor in a way that indicates the concentration of glucose. An algorithm then determines a person’s blood glucose level.”