Most of color vision tests require that the participant is aware of and actively takes part in the test. While this might seem like a minor requirement, it presents the possibility that, when motivated, participants can engage in subterfuge in order to pass the test. This study introduces the use of eye movements as a covert test to detect the presence of a color deficiency without requiring explicit input. An experiment was conducted in which the results suggest that the observed differences in eye movements alone can be used as an efficient metric for detecting colorblindness using the Ishihara images. To reduce the possibility that participants may realize they are being tested, a method to select new complex scenes for screening color vision status was developed. Another eye movement experiment was performed using selected scenes to validate the usefulness of the proposed method. The results show that this approach can be used to screen colorblind individuals without their knowledge or active participation, making the test less sensitive to subterfuge.