The main objective of this randomized trial comparing vision therapy to observation is to determine the short-term effectiveness of vision therapy on distance intermittent exotropia control. The results will help determine whether to proceed to a full-scale, long-term randomized trial.
Age 8 - 16 years
Distance exodeviation of 15∆ to 35∆ by prism alternating cover test (PACT)
IXT, exophoria, or orthophoria at near
Near exodeviation that does not exceed the distance exodeviation by more than 10∆
Treatment for IXT or amblyopia (other than refractive correction) within 3 months prior to enrollment
Office-based vision therapy for IXT within 6 months prior to enrollment
Prior office-based vision therapy for IXT of ≥10 sessions
Prior strabismus, intraocular, or refractive surgery (including BOTOX injection)
Southern California College of Optometry at Marshall B. Ketchum University
Lead sponsor
Stanford University
Collaborator
Ohio State University
Collaborator
Salus University
Collaborator
University of Alabama at Birmingham
Collaborator
Southern College of Optometry
Collaborator
Case Western Reserve University
Collaborator
American Academy of Optometry
Collaborator