Factors Associated with the Use of Botulinum Toxin Injections for Adult Strabismus in the IRIS Registry

This cross-sectional study used data from a large nationwide registry to describe the factors associated with use of botulinum toxin injections for adults with strabismus in the United States. Botulinum toxin injections were performed on 3.1% of adults undergoing an intervention for strabismus between 2013 and 2020. Adults treated with botulinum toxin injections were more likely to be older and female. Compared to non-Hispanic White patients, non-Hispanic Black patients were three times less likely to receive treatment with botulinum toxin after adjusting for age, sex, geographic region, and type of insurance. Efforts to understand the factors contributing to disparities in the use of botulinum toxin for strabismus may lead to opportunities for more equitable access to this intervention.