A low coherence light beam is irradiated to the eyeball. A backward scattered light beam, which is reflected from each depth position in the eyeball, and a reference light beam, which is reflected from a mirror capable of moving, are caused to interfere with each other. A first backward scattered light beam, which comes from the interface between the cornea and the anterior aqueous chamber, and a second backward scattered light beam, which comes from the interface between the anterior aqueous ch...

A method for predicting blood glucose level of a person includes performing on the person a near-infrared spectral scan of a body part at a first group of wavelengths and at a second group of wavelengths, determining a first group of near-infrared absorbance values for the first group of wavelengths and a second group of near-infrared absorbance values for the second group of wavelengths, determining a first difference for the first group of near-infrared absorbance values and a second differenc...

A building panel is described which can be used for either walls or floors. It comprises a thin shell unit of reinforced, monolithic cementitious material having a large, planar outer face and an inner face interconnected by parallel end edges and parallel side edges. A plurality of stud members are partially embedded in the inner face of the cementitious shell, these stud members being parallel to each other, laterally spaced from each other and being fabricated of about 15 to 25 gauge galvaniz...

The intensities of backscattering light generated by predetermined interfaces of an eyeball when a laser beam emitted from a semiconductor laser is projected onto the eyeball in a predetermined position are detected. The absorbance or refractive index of the aqueous humor in the anterior chamber of the eyeball is determined on the basis of the intensities of the backscattering light, and the glucose concentration in the aqueous humor is determined on the basis of the absorbance or refractive ind...

Blood glucose concentrations are measured by non-invasive methods and apparatus using visual pigment bleaching in conjunction with psychophysical methodologies. Bleaching light of selected wavelengths is projected through the pupil of the eye of an observer onto the fundus to bleach visual pigments in the eye. The observer's psychophysical response to a visual stimulus is then measured to obtain information regarding the rate of regeneration of the visual pigments. From the rate of pigment regen...

An apparatus for measuring a concentration of a substance in an eye (13) includes a measurement light source (4) producing a measurement light beam having a first wavelength at which the substance has a non-zero first absorption coefficient. The apparatus further includes a reference light source (6) producing a reference light beam having a second wavelength at which the substance has a second absorption coefficient which is substantially equal to zero. At least a portion of the measurement lig...

A small and portable instrument for measuring blood sugar level of a human body noninvasively with no error comprising a light source control section for irradiating the measurement part of a finger with irradiation lights in two different near-infrared wavelength regions, photodetectors for receiving lights and of the irradiation lights quantities of transmitted lights. A relative transmittance, i.e. the ratio of the quantities of transmitted lights of the same wavelength detected at the two po...

A tissue filter for medical collection is disclosed. The tissue filter includes a first member, a second member, and filter material secured thereto. The first and second members are selectively engaged with one another to define a filter body having a collection cavity. The collection cavity is open at one end for tissue to flow into the collection cavity. The first member and the second member may be selectively separated to facilitate tissue removal from the collection cavity.

An apparatus for measuring a blood component using the trans-reflectance of light irradiated to a transflective member disposed behind a test site. The apparatus includes an optical source unit irradiating light to the test site of a test subject; a transflective unit transflecting light transmitted through the test site; a detection unit detecting the transflected light; and an analysis unit analyzing the transflected light detected in the detection unit. A related method includes irradiating t...

The present invention relates to a hand-held fluorescence photometer and method for measuring an analyte level, preferably a blood glucose level, from an ocular fluid. The photometer is based on a dual beams measuring system and it is capable of defining the correct positioning for the measurement. Only when the apparatus is correctly positioned the actual analyte measurement automatically takes place.