Damage to which brain lobe typically causes vision deficits?

• A. Frontal lobe
• B. Parietal lobe
• C. Temporal lobe
• D. Occipital lobe

Answer: (D)

Vision processing happens in the occipital lobe, which sits at the back of the brain and houses the primary visual cortex that receives input from the eyes. When this area is damaged, visual information can be lost or distorted, often in the opposite side of the visual field (contralateral visual field deficit) or even more extensive loss like cortical blindness, depending on how large the injury is. The exact pattern of vision loss follows the pathways that carry visual information through the brain, so bigger or differently placed injuries can produce different field deficits. Other lobes deal with different functions: the frontal lobe governs planning and motor control, the parietal lobe handles touch and spatial processing, and the temporal lobe manages hearing and memory. Because vision deficits arise directly from disruption of the brain’s visual processing center, the occipital lobe is the most likely source of these changes.