Management of Binocular Vision Anomalies And Vision Therapy
Non-strabismic binocular vision dysfunction (NSBVD) are visual disorders that affect the person's binocular vision and visual outcome when performing near tasks causing eye strain, headache, and blurred vision. If left undiagnosed or untreated, this defect can increase or turn into strabismic dysfunction. It can be classified as accommodative and vergence anomalies. These anomalies of binocular vision have been reported to be highly prevalent among school-going children and in adults too.
Symptoms
All of the following are associated with reading or other near tasks
- Asthenopia and headache
- Intermittent blur & diplopia
- Symptoms worse at end of day
- Burning and tearing
- Inability to concentrate
- Sleepiness when reading
- Slow reading
- Signs
- Moderate to high exophoria or intermittent exotropia at near
- Reduced PFV at near
- Reduced vergence facility at near with base out prisms
- Intermittent suppression at near
- Receded near point of convergence
- Low AC/A
- Low MEM
- Low NRA
- Exo fixation disparity at distance and near