Glucose concentration measuring method and apparatus

A glucose concentration measuring method, comprising the steps of:

• i) irradiating an ultrashort pulsed light beam, which has been radiated out of a predetermined light source, to the eyeball,
• ii) measuring each of an intensity of a first backward scattered light beam of said ultrashort pulsed light beam, said first backward scattered light beam coming from an interface between the cornea and the anterior aqueous chamber of the eyeball, and an intensity of a second backward scattered light beam of said ultrashort pulsed light beam, said second backward scattered light beam coming from an interface between the anterior aqueous chamber and the crystalline lens of the eyeball,
• iii) obtaining light absorption characteristics of constituents of the aqueous humor, which fills the anterior aqueous chamber, from the intensity of said first backward scattered light beam and the intensity of said second backward scattered light beam,
• iv) obtaining light absorption characteristics of the constituents of the aqueous humor with respect to each of a plurality of other ultrashort pulsed light beams, which have wavelengths different from the wavelength of said ultrashort pulsed light beam, by repeating steps i)-iii) with each of the plurality of other ultrashort pulsed light beams, and
• v) calculating a concentration of glucose in the constituents of the aqueous humor from the light absorption characteristics, which have been obtained with respect to the plurality of said ultrashort pulsed light beams having different wavelengths.