The optic nerves send electrical signals from each eye to meet in the brain at the optic chiasma..
Here, the left visual signal from one eye is combined with the other eye an…d the same goes for the right visual signal..
Now the signals split again. The right visual heads for the left brain and the left visual makes its way to the right side of the brain..
This way, visual messages from both eyes will reach both halves of the visual cortex. The brain then merges the image into one image which you are looking out at the world with..
This partial crossing of the nerve fibers at the optic chiasm (or chiasma) is the reason why we humans have stereoscopic sight and a sense of depth perception. what is the function of the optic chiasm? (MORE)