Optic Lesions Flashcards
Where is the optic tract located?
Between the optic chiasm and the lateral geniculate nucleus (LGN)
What is the visual deficit associated with a lesion of the optic tract?
Contralateral homonymous hemianopia
What visual field loss occurs in both eyes due to a right optic tract lesion?
Loss of left visual field
Which retinal fibers does the optic tract carry?
- Ipsilateral temporal retinal fibers
- Contralateral nasal retinal fibers
What is a relative afferent pupillary defect (RAPD)?
May occur in the contralateral eye due to reduced input from the affected visual field
What might patients with optic tract lesions experience in terms of navigation?
Bumping into objects on one side or difficulty navigating
What are some causes of optic tract lesions?
- Tumors
- Stroke
- Trauma
- Inflammation/Demyelination
What tumors can cause optic tract lesions?
- Gliomas
- Pituitary adenomas
- Meningiomas
How can optic tract lesions be diagnosed?
- Perimetry
- Neuroimaging (MRI/CT)
What type of visual loss occurs with lesions of the optic nerve?
Monocular vision loss
What visual loss is associated with lesions of the optic chiasm?
Bitemporal hemianopia
What visual defect is caused by lesions of the optic radiations in the parietal lobe?
Contralateral inferior quadrantanopia
What visual defect is caused by lesions of the optic radiations in the temporal lobe?
Contralateral superior quadrantanopia
What is the visual loss associated with lesions of the lateral geniculate nucleus (LGN)?
Contralateral homonymous hemianopia
What type of visual loss occurs with lesions of the visual cortex?
Contralateral homonymous hemianopia
