Binocular Vision Dysfunction (BVD) is a condition where the eyes are slightly misaligned and the eyes struggle to send one clear image to the brain. BVD can cause a variety of symptoms such as dizziness, motion sickness, headache, and light sensitivity.
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.