[Natural fluorescence of nuclear cataract lenses and melanomas of the eye]

For various reasons, it is desirable to have an objective cataract classification system that does not depend on either the opinion of the physician or the patient. Since both highly molecular protein aggregates and chromophores are formed in cataractous lenses, which fluoresce under suitable stimulation, we have developed a fluorescence apparatus that illuminates the lens with five monochromatic wavelengths between 350 and 500 nm in situ. The fluorescence spectrum is recorded up to 100 ms with an optical multi-channel analyzer. This fluorescence method is non-invasive and does not harm the eye; it also uses the native fluorophore. The set of fluorescence spectra obtained by this method describes the condition of the cataractous lens both quantitatively and qualitatively. Because of the sensitivity of the method, it can also be used to assess the disease objectively in the early stages and to test and determine the effectiveness of anti-cataract drugs. Another use was discovered by using the fluorescence measurements for the diagnosis of malignant melanomas. With this equipment, melanomas in the eye and the surrounding area can be diagnosed both rapidly and precisely.