What is normal binocular vision?

Normally, both eyes are aligned on the same visual target and the images from each eye are merged in the brain to form a single three-dimensional image, or binocular vision. The brain’s process of merging or “fusing” images from each eye into one image is called binocular fusion. The perception of three-dimensional depth is called stereoscopic vision. Binocular vision develops during early infancy, and proper alignment during this time is necessary for normal binocular development to occur.