This study aimed to construct a simple and effective color-vision test pattern which determined type and degree of color deficiency. Multiple pairs of color stimuli within the MacLeod-Boynton chromaticity diagram were printed on a sheet of paper. Subjects were asked if difference in color was discernible for each pair. One protanope, one deuteranope and two normal color vision subjects were evaluated. It was observed that indiscrimination ranges increased along the protan and deutan confusion lines for the two color deficient subjects. These results show that this novel test pattern is effective in examining type of color deficiency.