S-BLR Versus C-BLR for CI-IXT in Children

Inclusion Criteria: * Exodeviation at least 15 at distance (6 meters); * Exodeviation at most 50 at near (1/3 meter); * Greater exodeviation at near than at distance by 10 or more; * Control score of exodeviation greater than 3; * Best-corrected visual acuity of 20/40 or better in the worse eye, and interocular difference of less than 2 lines; * Myopia5.00D, hyperopia3.0D and anisometropia≤2.5D based on cycloplegic refraction * Optical correction needed for at least 2 weeks before evaluation of exodeviation: myopia0.5D or astigmatism1.5D in either eye, or anisometropia1.0D; * Written informed consent given by participants and their parents or legal guardians. Exclusion Criteria: * Prior strabismus surgery or botulinum toxin injection; * Coexisting vertical deviation greater than 5, oblique muscle dysfunction, torsional deviation, dissociated vertical deviation, A-V pattern, or other conditions requiring horizontal rectus transposition, oblique surgery or vertical rectus surgery; * Paralytic or restrictive strabismus; * Lateral incomitance (greater exodeviation in right or left gaze position than in primary position by 5 or more with appropriate optical correction); * Ocular disease other than strabismus or refractive error; * Previous intraocular or refractive surgery; * Craniofacial malformations affecting the orbit; * Significant neurological disorders; * Birth date34 weeks or birth weight1500 gram. Abbreviations: CI-IXT, convergence insufficiency intermittent exotropia…