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.