Abstract
The article discusses promising optical methods for non-invasive blood glucose monitoring, in particular, optical coherence tomography (OCT), near-infrared (NIR), Raman spectroscopy, terahertz spectroscopy (THz), fluorescence spectroscopy, polarimetry, and oxyhemoglobin spectroscopy. The principles of each method, their advantages and limitations are described. Modern technological advances aimed at improving the accuracy, efficiency and convenience of these methods for clinical use, especially in the context of monitoring patients with diabetes, are considered.