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The first 25 slides, exactly as they appear. The full deck has 63 content slides.
Ophthalmology
Lesions of the Visual Pathway
Built from Khurana — Neuro-Ophthalmology
What’s inside
6 sections · 63 slides
Overview
- Why the visual pathway is a map you can read
- Roadmap of this deck
- Levels of the visual pathway and their field defects
Optic Nerve Lesions
Damage before the crossing — one eye is affected
- Optic nerve lesions: the basics
- Distal vs proximal optic nerve lesion
Chiasmal Syndrome
The crossing point — where nasal fibres decussate
- What the chiasma does and why lesions here matter
- Three types of chiasmal syndrome
- Chiasmal fibre crossing and junctional scotoma
- Field pattern from a chiasmal lesion
- Chiasmal syndrome: etiology
- Chiasmal syndrome: symptoms the patient reports
- Hemifield slide and postfixation blindness
- Chiasmal syndrome: the signs you find
- Optic disc and field changes in chiasmal disease
- Field defects in chiasmal disorders — the menu
- Junctional scotoma pattern
- Bitemporal hemianopia — the signature chiasmal defect
- Common causes of central chiasmal lesions (approx. %)
- Homonymous and binasal defects from the chiasmal region
- Incongruous homonymous hemianopia
- Bitemporal versus binasal field loss
- Endocrine clues to a pituitary chiasmal lesion
- Diagnosing and treating chiasmal syndrome
- Neuroimaging of a sellar mass
- The ophthalmologist's role after treatment
- Visual field recovery after pituitary surgery
- OCT retinal nerve fibre layer for prognosis
Retrochiasmal Lesions
Behind the crossing — homonymous defects that grow more congruous
- The unifying rule behind the chiasma
- Congruous versus incongruous homonymous defects
- Tumour vs vascular: how homonymous defects behave
- Optic tract syndrome — two flavours
- Optic tract syndrome: Type I vs Type II
- Bow-tie (band) optic atrophy
- Field defect of optic tract syndrome
- Lateral geniculate nucleus (LGN) lesions
- Sectoranopia from geniculate infarction
- Optic radiations: temporal lobe lesions
- Meyer's loop and the pie-in-the-sky defect
- Systemic features of temporal lobe lesions
- Homonymous hemianopia denser superiorly
- Optic radiations: parietal lobe lesions
- Pie-in-the-floor inferior quadrantanopia
- Neurologic features of parietal lobe lesions
- Homonymous hemianopia denser inferiorly
Lesions of the Visual Cortex
The occipital lobe — the most congruous defects of all
- How occipital lesions announce themselves
- Central homonymous hemianopia
- Temporal crescent — the occipital lobe's unique defect
- Temporal crescent representation in the cortex
- Macular-sparing homonymous hemianopia
- Bilateral occipital lobe lesions
- Ring scotoma and checkerboard defects
- Other manifestations of occipital lobe lesions
Putting It Together
Reading the field defect back to the lesion
- Localising by field defect — one-glance summary
- Key takeaways
- Why does a central chiasmal lesion cause bitemporal hemianopia?
- References
- Neuro-Ophthalmology