Clipping Board » Disease & Prevention ─ Understanding diseases, prevention is better than cure.
[Liberty Times reporter Meng Qingci / Tainan Report] Updated: "2011/05/19 04:11"
Visual problems may not always stem from the eyes—they could be caused by more serious illnesses!
An 80-year-old woman recently experienced difficulty moving her hands and feet. When her family took her out, she could see the car door handle but repeatedly failed to grasp it. After ruling out issues with muscles and coordination, a neurologist performed a brain MRI scan, which revealed a tumor in the right parietal lobe of her brain. Further investigation traced the cause of the tumor to a metastasis from a kidney tumor. The woman has since been transferred to the relevant department for treatment.
Dr. Cai Zitong, a neurologist at National Cheng Kung University Hospital, explained that while humans rely on their eyes to see objects, further judgments about an object's shape, color, distance, and spatial relationships depend on the brain's corresponding regions.
Dr. Cai pointed out that light reflecting off an object enters the retina of the eye and is then transmitted via the optic nerve to the occipital lobe of the brain, allowing the person to see the object.
However, after seeing an object, additional judgments about its shape, color, and motion require analysis by the brain's temporal lobe. If the occipital lobe is functioning normally but the temporal lobe is affected by disease, a person may still see but be unable to discern whether an object is round or flat, or even determine if a mango on a tree is ripe—because they cannot distinguish the color indicating ripeness.
The ability to perceive an object's spatial orientation and distance relies on the parietal lobe. Seeing a car door handle but repeatedly failing to grasp it indicates a problem with "visual-spatial" judgment.
Dr. Cai noted that in clinical practice, there are cases where visual dysfunction ultimately leads to the discovery of tumor metastasis. When diagnosing, doctors must trace the source of visual impairment step by step based on symptoms and then identify the root cause for treatment.
Source: http:/ / tw. news. yahoo. com/ art……url/ d/ a/ 110519/ 78/ 2rsje. html
Visible but Untouchable: Brain Metastasis from Tumor
Visual problems may not always stem from the eyes—they could be caused by more serious illnesses!
An 80-year-old woman recently experienced difficulty moving her hands and feet. When her family took her out, she could see the car door handle but repeatedly failed to grasp it. After ruling out issues with muscles and coordination, a neurologist performed a brain MRI scan, which revealed a tumor in the right parietal lobe of her brain. Further investigation traced the cause of the tumor to a metastasis from a kidney tumor. The woman has since been transferred to the relevant department for treatment.
Dr. Cai Zitong, a neurologist at National Cheng Kung University Hospital, explained that while humans rely on their eyes to see objects, further judgments about an object's shape, color, distance, and spatial relationships depend on the brain's corresponding regions.
Dr. Cai pointed out that light reflecting off an object enters the retina of the eye and is then transmitted via the optic nerve to the occipital lobe of the brain, allowing the person to see the object.
However, after seeing an object, additional judgments about its shape, color, and motion require analysis by the brain's temporal lobe. If the occipital lobe is functioning normally but the temporal lobe is affected by disease, a person may still see but be unable to discern whether an object is round or flat, or even determine if a mango on a tree is ripe—because they cannot distinguish the color indicating ripeness.
The ability to perceive an object's spatial orientation and distance relies on the parietal lobe. Seeing a car door handle but repeatedly failing to grasp it indicates a problem with "visual-spatial" judgment.
Dr. Cai noted that in clinical practice, there are cases where visual dysfunction ultimately leads to the discovery of tumor metastasis. When diagnosing, doctors must trace the source of visual impairment step by step based on symptoms and then identify the root cause for treatment.
Source: http:/ / tw. news. yahoo. com/ art……url/ d/ a/ 110519/ 78/ 2rsje. html