In the context of vision and visual perception, fusion refers to the brain''s ability to combine the slightly different images (disparities) received from each eye into a single three-dimensional (3D) perception.
This process is called binocular fusion, and it is essential for achieving depth perception and experiencing the three-dimensional world.
When both eyes fixate on an object as a single image, a small amount of error is tolerated along the visual axes, producing a slight retinal asymmetry called Fixation Disparity.
