The Effectiveness of Visual Training in Convergence Insufficiency Patients
Convergence Insufficiency
About this trial
This is an interventional health services research trial for Convergence Insufficiency focused on measuring Visual training, Prism, Binocular vision
Eligibility Criteria
Inclusion Criteria: The overall score of CI symptom survey ≥ 16 (9-18 years old) or ≥ 21 (19-30 years old) The break point of near point of convergence (NPC) ≥ 6 cm Exophoria at near distances be at least 4∆ higher than at far distances Near positive fusional vergence (PFV) ≤ 15∆ or failing Sheard's criterion at near. Exclusion Criteria: The best corrected visual acuity (BCVA) of < 20/25 in each eye at far and near distances Amblyopia patients or the difference of BCVA between the two eyes ≥ 2 lines Constant strabismus patients History of strabismus surgery or refractive surgery Systemic diseases that would affect binocular vision Acquired brain injury or neurological disorder.
Sites / Locations
- National Taiwan University HospitalRecruiting
Arms of the Study
Arm 1
Arm 2
Active Comparator
Experimental
Stop training group
Continune training group
Home-base prism training during week 1-6 --> then stop training during week 7-12 --> endpoint data collected at week 12
Home-base prism training during week 1-12 --> endpoint data collected at week 12