| 摘要 |
<p>PCT No. PCT/DE86/00478 Sec. 371 Date Sep. 29, 1987 Sec. 102(e) Date Sep. 29, 1987 PCT Filed Nov. 24, 1986 PCT Pub. No. WO87/03188 PCT Pub. Date Jun. 4, 1987.The invention is directed to an apparatus for making in vivo measurements of eye lens cloudiness such as caused by cataracta nuclearis. The lens of the human eye has an inherent fluorescence which corresponds to the cloudiness. The apparatus of the invention includes a projecting device for projecting a slit image onto the eye lens with a monochromatic excitation beam having a wavelength lying in the range of 350 nm-500 nm. The light beam excites the fluorescence in the eye lens to produce a fluorescence light. A measuring device measures the fluorescence light in the wavelength range of 380 nm to 650 nm. A signal processing unit analyzes the fluorescence spectrum to determine the wavelength corresponding to a maximum intensity of the fluorescence spectrum. The signal processing unit includes a memory having a scale of values for eye lens cloudiness and stores an empirically determined table of values of the measured parameters corresponding to the scale values. Actual measured parameters are compared to the table of values to determine the degree of eye lens cloudiness.</p> |
