1. An apparatus for determining a glucose level of an individual, comprising: a processor configured to execute modules comprising: a calibration module configured to produce a calibration table created by analyzing a plurality of portions of Newton's Rings in images from a calibration eye at multiple wavelengths obtained at various glucose levels, using first base image parameters, said calibration module configured to store said calibration table in a storage medium; an image acquisition module configured to receive captured images of a plurality of portions of Newton's Rings in an eye of said individual at said multiple wavelengths from means for capturing images, using second base image parameters that approximate said first base image parameters; an image compensation module for compensating the captured images for differences between said base image parameters; and a dynamic pattern matching module for comparing points on said plurality of portions of Newton's Rings from said compensated captured images to corresponding points in said calibration table at said multiple wavelengths to determine various possible concentration values for each wavelength, and for determining one common answer from the various possible concentration values as said glucose level of said individual.