The tests are designed as follows:
1. For each color vision deficiency (protanopia, deutanopia or tritanopia) test, five confusion lines are selected by using click-draw. Three points on each confusion line that can be distinguished by the normal observer are chosen.
2. For each test, a confusion line is selected randomly. A point is selected randomly among the set of three. It is displayed in the upper test panel at a random luminance in the form of random dots. The three points are displayed in the lower three panels at a random luminance and also in the form of random dots.
3. The subject is asked to check one of the lower panels which color matches that of the test panel.
