Where does the fusion of two ocular images primarily occur?

The fusion of two ocular images primarily occurs in the brain, specifically in the visual cortex. When the eyes receive visual information, each eye sends separate images to the brain. The brain processes these images and merges them into a single cohesive perception, which allows for depth perception and a three-dimensional understanding of the environment.

This process is known as binocular vision and is crucial for coordinating the visual input from both eyes. The brain utilizes various mechanisms, including alignment and disparity of the images, to achieve this fusion. Effective fusion requires proper alignment of the eyes, which is typically maintained through various muscular adjustments and indicates the importance of brain function in visual processing.

Other options, while related to vision, do not play a direct role in the fusion of images. The retina captures and converts light into neural signals, the cornea helps to focus light onto the retina, and the optic nerve transmits visual information from the retina to the brain. However, it is the brain that ultimately integrates and fuses these signals to form a unified visual perception.