What does Fusion refer to in terms of vision?

Fusion in the context of vision refers to the process by which the brain combines the images received from both eyes into a single coherent view. When both eyes are aligned and functioning together properly, they provide slightly different perspectives of the same scene. Fusion allows the brain to integrate these two images to create depth perception and a unified visual experience. This is essential for activities such as depth judgment and spatial awareness.

The other options pertain to different visual processes. The separation of visual images relates to diplopia or double vision, while adjusting focus for near objects pertains to accommodation. Ignoring distractions involves the brain's ability to filter out irrelevant visual stimuli, which is more about attention than the act of fusion itself. Thus, the definition that best fits fusion is indeed the coordination of images from both eyes into one single picture.