This study is designed to evaluate changes in objective measures of disparity vergence after office-based vergence/accommodative therapy (OBVAT) for convergence insufficiency (CI) in children 12-17 years old.
30 participants with normal binocular vision and 30 with CI will be recruited for this prospective study. All participants with CI will be treated with 12 weeks of office-based vergence/accommodative therapy. The primary outcome measure will be the average peak velocity for 4° symmetrical convergence steps. Other objective outcome measures of disparity vergence will be time to peak velocity, latency, and accuracy. Changes in clinical measures \[near point of convergence (NPC), positive fusional vergence at near (PFV)\] and symptoms will be evaluated.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
TREATMENT
Masking
NONE
Enrollment
60
one -to-one treatment by a trained therapists. The subject is asked to perform 5-6 therapy procedures during a 60 minute therapy session. The subject is also asked to perform 15 minutes per day of home-based therapy.
Salus University
Philadelphia, Pennsylvania, United States
RECRUITINGChange in average peak velocity for 4° symmetrical convergence steps after 12 weeks of therapy
The ISCAN RK-826PCI binocular tracking system (Burlington, MA) will be used used to objectively record horizontal vergence eye movements. Five parameters will be measured with this instrument and the primary outcome measures will be the change in average peak velocity for 4° symmetrical convergence steps
Time frame: After 12 weeks of therapy
Change in time to peak velocity for 4° symmetrical convergence steps after 12 weeks of therapy
The ISCAN RK-826PCI binocular tracking system (Burlington, MA) will be used used to objectively record horizontal vergence eye movements. Five parameters will be measured with this instrument and a secondary outcome measures will be the change in time to peak velocity for 4° symmetrical convergence steps
Time frame: After 12 weeks of therapy
Change in latency for 4° symmetrical convergence steps after 12 weeks of therapy
The ISCAN RK-826PCI binocular tracking system (Burlington, MA) will be used used to objectively record horizontal vergence eye movements. Five parameters will be measured with this instrument and a secondary outcome measures will be the change in latency for 4° symmetrical convergence steps
Time frame: After 12 weeks of therapy
Change in accuracy for 4° symmetrical convergence steps after 12 weeks of therapy
The ISCAN RK-826PCI binocular tracking system (Burlington, MA) will be used used to objectively record horizontal vergence eye movements. Five parameters will be measured with this instrument and a secondary outcome measures will be the change in accuracy for 4° symmetrical convergence steps
Time frame: After 12 weeks of therapy
Change in settling time for 4° symmetrical convergence steps after 12 weeks of therapy
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The ISCAN RK-826PCI binocular tracking system (Burlington, MA) will be used used to objectively record horizontal vergence eye movements. Five parameters will be measured with this instrument and a secondary outcome measures will be the change in settling time for 4° symmetrical convergence steps
Time frame: After 12 weeks of therapy
Change in the near point of convergence
The near point of convergence will be measured using the Near Point Rule at baseline and after 12 weeks of therapy. The change in this measurement will a secondary clinical outcome measure.
Time frame: After 12 weeks of therapy
Change in the positive fusional vergence
Positive fusional vergence will be measured using a handheld target placed 40 cm from the participant and using a horizontal prism bar. Positive fusional vergence will be measured at baseline and after 12 weeks of therapy. The change in this measurement will a secondary clinical outcome measure.
Time frame: After 12 weeks of therapy