 Recently, Rouse et al 2004 administered a revised version of the Convergence Insufficiency Symptom Survey CISS to 46 adults with CI and 46 with normal binocular vision to assess reliability and validity. The CISS is a 15 item 4-point Likert survey that quantifies the severity symptoms with a score range from 0 to 60. The mean CISS score for the CI and normal groups were 37.3 and 11.0, respectively. The interclass correlation coefficient was 0.89, and the 95 limits of agreement were -9.0 to 7.6 indicating good to excellent reliability. These results raise questions about the CI and AI of adults with visual discomfort symptoms and suggest oculomotor dysfunction could be a possible cause of this disorder. 