Diagnostic significance of pathological changes in the fundus

1. Big picture

Fundus examination is important in neurology because the retina and optic nerve head are visible parts of the nervous system and its blood vessels. A good fundus examination can reveal:

1. Raised intracranial pressure → papilledema, absent venous pulsation.

2. Optic nerve disease → optic neuritis, optic atrophy, compressive optic neuropathy.

3. Retinal vascular disease → retinal artery or vein occlusion, hypertensive or diabetic retinopathy.

4. Systemic disease → severe hypertension, diabetes, vasculitis, endocarditis, leukemia, thrombocytopenia.

5. Contraindications to lumbar puncture → papilledema or signs of raised intracranial pressure require neuroimaging first.

For the exam, the key logic is: fundus changes help decide whether the problem is ocular/optic nerve, intracranial pressure, vascular, inflammatory, or systemic.