What aspect is crucial for both eyes working together in vision?

The crucial aspect for both eyes working together in vision is corresponding retinal images. For binocular vision to occur, both eyes must effectively align and focus on the same object. This alignment ensures that the images received by each eye correspond accurately, allowing the brain to fuse these images into a single, three-dimensional perception of depth and space. Each eye captures a slightly different angle of the same object, and these differences are essential for depth perception.

Other aspects listed, such as different light sources, eye color, and age of the individual, do not fundamentally affect the synergy required for binocular vision. While varied lighting can impact visibility or contrast, it does not relate to the coordination of retinal images necessary for effective vision. Eye color is purely aesthetic and does not influence how the eyes function together. Age can affect vision overall, but it does not specifically pertain to the critical requirement of corresponding retinal images for integrated visual processing.