Final answer:
The occipital lobes, responsible for visual processing, are most likely damaged if a child can no longer see despite intact eyes after a head injury.
Step-by-step explanation:
If a child sustains a severe blow to the head and can no longer see despite having fully functional eyes, the brain area most likely damaged is the occipital lobes. The occipital lobes are responsible for processing visual information from the eyes. Damage to this area can lead to blindness or visual disturbances, known as cortical blindness, where the eyes are unharmed, but the brain cannot process visual signals.