 For patients who have had healthy vision heretofore until a small, horizontal deviation set in suddenly, the injection of botulinum toxin may allow them to maintain the binocular vision skills that had been acquired earlier.Some consider botulinum injections to be a treatment option for children with small- to moderate-angle infantile esotropia.Studies have provided indications that performing injections into both medial rectus muscles may be more effective than an injection into one medial rectus muscle alone.