IntroductionThe Convergence Insufficiency Symptom Survey (CISS) is a 15-item questionnaire used as both a diagnostic tool and measure of symptomatology in the Convergence Insufficiency Treatment Study (CITS) and ongoing Convergence Insufficiency Treatment Trial (CITT) to quantify the severity of symptoms associated with convergence insufficiency (CI).Methods32 patients ages 8 to 18 were enrolled in a prospective, masked clinical trial. CISS scores of patients with and without CI (as defined by CITS) who presented for a routine eye examination were rcompared. Patients completed the CISS and then underwent a complete eye examination, including visual acuity, assessment of distance and near ocular alignment, near point of convergence, convergence and divergence amplitudes, and monocular near point of accommodation.ResultsPreliminary results of the mean score on the CISS for the convergence insufficiency group (n=9) was 19.2 (SD = 12.9) vs. 16.5 (SD = 11.7) for the non-CI group (n = 23). There was no statistical difference between the two groups (P = 0.7).DiscussionOur results suggest that a high CISS score may be found in patients without clinical CI. A related question (relevant to CISS use as a measure of treatment effect in clincal studies) is the test–retest variability over time.ConclusionsThere may be no reliable difference in the CISS score in pediatric patients with and without convergence insufficiency. IntroductionThe Convergence Insufficiency Symptom Survey (CISS) is a 15-item questionnaire used as both a diagnostic tool and measure of symptomatology in the Convergence Insufficiency Treatment Study (CITS) and ongoing Convergence Insufficiency Treatment Trial (CITT) to quantify the severity of symptoms associated with convergence insufficiency (CI). The Convergence Insufficiency Symptom Survey (CISS) is a 15-item questionnaire used as both a diagnostic tool and measure of symptomatology in the Convergence Insufficiency Treatment Study (CITS) and ongoing Convergence Insufficiency Treatment Trial (CITT) to quantify the severity of symptoms associated with convergence insufficiency (CI). Methods32 patients ages 8 to 18 were enrolled in a prospective, masked clinical trial. CISS scores of patients with and without CI (as defined by CITS) who presented for a routine eye examination were rcompared. Patients completed the CISS and then underwent a complete eye examination, including visual acuity, assessment of distance and near ocular alignment, near point of convergence, convergence and divergence amplitudes, and monocular near point of accommodation. 32 patients ages 8 to 18 were enrolled in a prospective, masked clinical trial. CISS scores of patients with and without CI (as defined by CITS) who presented for a routine eye examination were rcompared. Patients completed the CISS and then underwent a complete eye examination, including visual acuity, assessment of distance and near ocular alignment, near point of convergence, convergence and divergence amplitudes, and monocular near point of accommodation. ResultsPreliminary results of the mean score on the CISS for the convergence insufficiency group (n=9) was 19.2 (SD = 12.9) vs. 16.5 (SD = 11.7) for the non-CI group (n = 23). There was no statistical difference between the two groups (P = 0.7). Preliminary results of the mean score on the CISS for the convergence insufficiency group (n=9) was 19.2 (SD = 12.9) vs. 16.5 (SD = 11.7) for the non-CI group (n = 23). There was no statistical difference between the two groups (P = 0.7). DiscussionOur results suggest that a high CISS score may be found in patients without clinical CI. A related question (relevant to CISS use as a measure of treatment effect in clincal studies) is the test–retest variability over time. Our results suggest that a high CISS score may be found in patients without clinical CI. A related question (relevant to CISS use as a measure of treatment effect in clincal studies) is the test–retest variability over time. ConclusionsThere may be no reliable difference in the CISS score in pediatric patients with and without convergence insufficiency. There may be no reliable difference in the CISS score in pediatric patients with and without convergence insufficiency.