Fusion is the process by which the brain combines the images received from both eyes into one coherent image. It is a key component of binocular vision and enables the perception of depth and three-dimensionality. Fusion enables correct spatial vision, which is essential for many everyday activities such as judging distances or accurately manipulating objects. Problems with fusion can lead to image doubling (diplopia) or difficulties with depth perception. Vision therapies and orthoptic exercises can help improve fusion abilities in people with bifocals.
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