Relationship between Thyrotropin Binding Inhibitory Immunoglobulin and Strabismus-associated Thyroid Eye Disease Stability

Purpose: To investigate the relationship between thyrotropin binding inhibitory immunoglobulin (TBII) and deviation angle stability in strabismus-associated thyroid eye disease.Methods: A total of 25 strabismus-associated thyroid eye disease patients who were followed up for > 6 months without surgery were enrolled. To investigate the correlation between TBII levels and changes in the deviation angle, a test period of 6 months from the date of TBII measurement was established and 55 test units of the corresponding TBII levels were obtained.Results: The deviation angle had a positive correlation with the TBII levels (r = 0.473, p < 0.001), but did not correlate with sex, age, and thyroid hormone levels. Changes in the horizontal, vertical, and total deviation angles were significantly greater in the high-TBII test units compared to the normal-TBII test units (p= 0.029, = 0.032, and = 0.009, respectively).Conclusions: TBII levels were related to deviation angle stability in strabismus-associated thyroid eye disease. TBII may be a useful indicator for deviation angle stability in these patients over a period of 6 months.