Patent ID: 6926407
Filing Date: 2005-08-09
Classification: A61B,G01N

Abstract:
1. An apparatus for measuring a hue of a predetermined primary color included in a beam of light reflected from a surface of a bulbus oculi, the apparatus having: a diffuse light source for creating a beam of incident light comprising a plurality of primary colors including the predetermined primary color, the beam of incident light being directed onto the surface, the beam of incident light being substantially coaxial with an incident light beam axis; the beam of incident light being reflected from the surface to produce the beam of reflected light, the beam of reflected light being substantially coaxial with a reflected light beam axis; a photometer positioned for receiving and analyzing said reflected light to provide objective chromaticity data representing the hue of the predetermined primary color; a support for positioning the surface in a predetermined position relative to the light source and the photometer, and further additionally including at least one target for viewing by the patient to position the surface in the predetermined position relative to the light source and the photometer; the incident light beam axis and the reflected light beam axis forming a predetermined angle between approximately 30° and approximately 50°; and a scale adapted for converting said objective chromaticity data to a clinical score measuring the hue of the predetermined primary color in said reflected light, whereby, when said incident light is directed onto the surface and the incident light beam axis and the reflected light beam axis form the predetermined angle, reflected light is received and analyzed by the photometer to provide said objective chromaticity data, and the scale converts said objective chromaticity data to the clinical score to measure the hue of the predetermined color in said reflected light.