Method and apparatus for noninvasive determination of a disease state of a human eye

摘要

To determine a cataract or the degree of cataractogenesis in an eye of a patient, the patient views two lights juxtaposed, wherein each light comprises a mixture of two different wavelength lights. One of the lights is a fixed reference mixture, while the mixture of the other non-fixed light is varied until the patient observes a match between the two light mixtures in terms of hue, brightness and saturation. The luminance levels of the light components of the non-fixed mixture for providing the match and the proportionate levels of the two components are then determined. The shorter wavelength light of the non-fixed mixture is then substituted with a new wavelength light and the new mixture varied again until the patient observes a match as before. Alternatively, a polarization state of the shorter wavelength light is altered before determining a new mixture for obtaining a match. The luminance levels of the light components of the new mixture are then determined and another proportion obtained representative of the proportionate levels thereof. The first and second proportions are then compared to respective proportions of a standardized group. Deviations between the proportions of the patient and the standardized group indicate the existence of a cataract and/or the degree of a cataract precursor formation.