The subject invention relates to combinatorial analyses of data from two or more diagnostic tests for the detection of eye diseases, simplified interpretation of test results, and assessment of disease stage and rate of change. Of particular interest is to develop combinatorial analyses to improve glaucoma detection and progression rate assessment based on combinations of structural and functional tests. More specifically, approaches are described where data of one or more tests and their normative database are converted to the distribution and scale of another test for further analysis to detect glaucomatous damage approaches are also described where data of more than one tests are used to assess stage index and rate of change in addition, methods for displaying the combinatorial analysis results are disclosed.