Abstract: A diagnostic tool for evaluating a patient's oculomotor system includes tests for measuring the amount of a patient's heterophoria and fixation disparity and determining whether these two measurements bear a normal or abnormal relationship. If the results of these tests do not bear a normal relationship, it is concluded that an oculomotor imbalance or dysfunction exists and further analysis should be performed to determine the precise nature of the dysfunction. The diagnostic tool may comprise a near-point card on which tests for heterophoria and fixation disparity are printed, as well as a graph indicating the expected or normal relationship between the results of these two tests. Additional diagnostic tests may be included on the card.