Patent ID: 6851809

Claim:
A color deficiency vision test implemented on computer displays capable of rendering a range of colors defined by a color space, said computer display being of unknown calibration and associated with a test subject, said test comprising the steps of: a. selecting a confusion line associated with a particular color vision deficiency; b. selecting a set of distractor colors extending both in luminance and chromaticity, said distractor set oriented so it is approximately aligned with the plane normal to said confusion line and intersected approximately at its centroid by said confusion line, extending above and below a luminance plane on which said confusion line is located; c. selecting a target color in said color space, said target color separated from said distractor set by a chromatic separation along said confusion line associated with a particular color vision deficiency; d. quasi-randomly assigning the distractor and target colors to locations in a test plate; e. rendering a plurality of modified test plates on a display device to test for color vision deficiency corresponding to said target color, said modification based upon varying the distance between said distractor set and said target color; and f repeating steps c-d in multiple regions of said color space and identifying the presence or absence of said particular color vision deficiency.