These visual fields suggest a lesion in the?
Incorrect. Optic tract lesions cause a homonymous hemianopia, which consists of binocular visual field defects on the same side of visual space that have borders aligned to the vertical meridian. The defects you see here are not homonymous. Try again!
Incorrect. Occipital lobe lesions cause a homonymous hemianopia, which consists of visual field defects on the same side of visual space that have have borders aligned to the vertical meridian. The defects you see here are not homonymous. Try again!
Incorrect. An optic nerve lesion would cause a defect limited to one eye. It would not have a major defect border aligned to the vertical meridian. The defects you see here are in both eyes and one border is aligned to the vertical meridian. Try again!
Correct. You are looking at bitemporal hemianopia, defects in both eyes that are limited to the temporal visual fields and have borders aligned to the vertical meridian.They reflect damage to the retinal ganglion cell axons that cross within the optic chiasm. These crossing axons are particularly vulnerable to any type of optic chiasm lesion, no matter whether it arises within the chiasm itself or compresses it from any direction.