Binocular fusion refers to the brain's ability to gather information received from each eye separately and form a single, unified image. If one's eyes are not precisely aligned, you may experience blurred or double vision, discomfort, confusion or avoidance. If that occurs, the brain often subconsciously suppresses the vision in one eye to avoid confusion. That eye may then develop poorer visual acuity. This is known as amblyopia or lazy eye.