| abstract |
Electromagnetic radiation reflectivity from the body is measured. One form of the invention measures essentially without spectral analysis. The eye (30) is an advantageous part of the body for measurement. A monochrome detector array, e.g., black, and white CCD camera (10), suffices for the measurements. The apparatus detects changes in level of the reflected radiation, and relates the changes to glucose concentration. The relationship is monotonic as between glucose, and amount of reflected radiation. The system may operate with visible light, particularly in the yellow/green, or both; and may take into account a reverse signal response in the red IR, or both. |