diabetic retinopathy діабетична ретинопатія Jones matrix Raman spectroscopy artificial intelligence automated diagnosis blood plasma convolutional neural network deep learning diabetes fluorescence spectroscopy fundus imaging glucose level image preprocessing infrared radiation machine learning mammary gland neural network non-invasive monitoring ophthalmology ophthalmoscopy optical coherence tomography oxyhemoglobin spectroscopy polarimetry polycrystalline network statistical analysis terahertz spectroscopy tomography Раманівська спектроскопія автоматизована діагностика