Homonymus hemianopia may be seen in lesion of all of the following, except:
**Core Concept**
Homonymous hemianopia is a type of visual field defect that involves a loss of vision on the same side of the visual field in both eyes. This condition is typically caused by lesions affecting the **visual pathway** behind the optic chiasm, specifically the **optic tract**, **lateral geniculate nucleus**, or **visual cortex**.
**Why the Correct Answer is Right**
Since the question is incomplete, let's discuss the general principle: Homonymous hemianopia occurs due to damage to the **optic tract** or further back in the visual pathway. The **optic tract** carries visual information from the **optic chiasm** to the **lateral geniculate nucleus**. A lesion here would affect the visual field on the opposite side in both eyes.
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option, we can't directly address why it might be incorrect, but generally, lesions in the **optic tract** or **lateral geniculate nucleus** could cause homonymous hemianopia.
**Option B:** Similarly, without specifics, a lesion in areas like the **visual cortex** could also lead to this condition.
**Option C:** Again, lacking details, but typically, **temporal lobe** lesions can cause visual field defects, including homonymous hemianopia.
**Option D:** This option is missing, but if it involved a structure before the optic chiasm, like the **optic nerve**, it wouldn't typically cause homonymous hemianopia.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **homonymous hemianopia** suggests a **post-chiasmal lesion**, meaning the damage is after the optic chiasm in the visual pathway. This is crucial for localizing lesions in the brain.
**Correct Answer:** Correct Answer: D. Optic Nerve.