| 摘要 |
A light beam, which has been radiated out of a predetermined light source, is irradiated to the eyeball lying at a predetermined position. Each of intensity values of first and second backward scattered light beams of the light beam having been irradiated to the eyeball is detected. The first backward scattered light beam comes from an interface between the cornea of the eyeball and the ambient air, and the second backward scattered light beam comes from an interface between the cornea and the anterior aqueous chamber of the eyeball. A refractive index of the aqueous humor, which fills the anterior aqueous chamber, is calculated from the intensity values of the first and second backward scattered light beams. A concentration of glucose in the aqueous humor is calculated in accordance with correlation between the refractive index of the aqueous humor and the concentration of glucose in the aqueous humor, which correlation has been found previously, and in accordance with the calculated refractive index of the aqueous humor.
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