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
• B. Right occipital lobe lesion
• C. Optic chiasma lesion
• D. Right optic nerve lesion

Answer 1

The Correct Option is A

In the scenario presented, the patient is experiencing a loss of vision on the right side of the visual field in both eyes. This condition is termed "homonymous hemianopia." To determine the most probable cause, we must analyze the visual pathway and understand where lesions might lead to such symptoms.

The visual pathway consists of several key components: the optic nerves, optic chiasma, optic tracts, lateral geniculate body, optic radiations, and visual cortex. A lesion at different points in this pathway can lead to different patterns of visual field loss:

1. Right Optic Nerve Lesion: This would cause complete loss of vision in the right eye, not just the right visual field in both eyes. Therefore, this option does not match the symptoms.
2. Optic Chiasma Lesion: Classically causes bitemporal hemianopia, where the outer temporal visual fields are lost in both eyes. Again, this does not match our patient's symptoms.
3. Right Occipital Lobe Lesion: Typically causes left homonymous hemianopia (loss of left field of vision in both eyes). This is the mirror image of the symptoms the patient experiences, thus incorrect.
4. Injury to Left Optic Tract: A lesion here would interrupt fibers carrying information from the right visual field of both eyes. This would cause right homonymous hemianopia, matching the symptoms described in our case.

Having analyzed the options and the pathophysiology of visual field defects, the most probable cause of the patient’s inability to see the right side from both eyes is Injury to the Left Optic Tract.