Only a small part of what the eye 'sees' is in focus. To turn the image on the retina into complete vision the eye needs help from the brain.
- The brain processes the raw information coming from the eye in a number of ways.
- The brain combines multiple partially focused images to give the illusion that everything is in focus.
- The brain combines the information from both eyes into a single image.
- The eye's lens projects images on to the retina upside down, so the brain must flip it the right way up again.
Your brain must process the raw image coming from the eye in a number of ways.
How we see
Incredibly, only one tiny area of each eye has cone cells packed tightly enough for sharp colour vision.
Within the region called the macula is the fovea, and it's only in this ...