Question
A 33 year old female patient presented with inability to see the right side from both the eyes What is the most probable cause
| A. |
Injury to Left Optic Tract
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| B. |
Right occipital lobe lesion
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| C. |
Optic chiasma lesion
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| D. |
Right optic nerve lesion
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Show Answer
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Correct Answer � A
Explanation
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The visual pathway is a complex system that starts from the retina and ends in the occipital cortex of the brain. The information from the right half of the visual field of both eyes is processed by the left side of the brain, and vice versa.
A. Injury to Left Optic Tract: An injury or lesion to the left optic tract will result in a loss of the right visual field in both eyes, a condition known as right homonymous hemianopia. This is because the left optic tract carries information from the right visual field of both eyes.
B. Right occipital lobe lesion: This would also result in a loss of the left visual field in both eyes (left homonymous hemianopia) because the right occipital lobe processes visual information from the left visual field.
C. Optic chiasma lesion: A lesion here would affect fibers crossing from both eyes. Depending on the exact location and extent of the lesion, it could result in bitemporal hemianopia (loss of the outer/temporal visual field of both eyes) or other visual field defects, but not the specific defect described in the question.
D. Right optic nerve lesion: A lesion to the right optic nerve would cause blindness in the right eye only, not a visual field defect in both eyes.Various visual pathway defects include:
