Indications involving the horizontal rectus muscles (53 eyes) were residual strabismus, Duane’s retraction syndrome (DRS) with eso- (type I)/exodeviation (type II, type III), partial abducens nerve palsy, partial oculomotor nerve palsy, Möbius syndrome, congenital fibrosis of the extraocular muscles type 3A (CFEOM3A, TUBB3 mutation), and orbital apex syndrome (supplementary Table 1). Here, TUBB3 is linked to Strabismus.