Hypertension and the eye
- Eye and systemic disease
High blood pressure narrows and damages retinal vessels. Disc swelling with very high pressure is a hypertensive emergency.
See it in 3D: Retina · Central retinal artery · Optic disc
What it is
The retina shows the effect of blood pressure on small arteries directly. Chronic hypertension narrows and stiffens the arterioles and compresses the veins where they cross. Severe, acute hypertension breaks the blood-retinal barrier: haemorrhages, cotton-wool spots, exudates and finally swelling of the optic disc. Hypertension also raises the risk of retinal vein and artery occlusions and ischaemic optic neuropathy.
Eye findings
- Mild: generalised arteriolar narrowing, arteriovenous nicking, copper or silver wiring.
- Moderate: flame haemorrhages, cotton-wool spots, hard exudates (a macular star).
- Severe (malignant): the above plus optic disc swelling.
- Choroidal ischaemia can cause patchy spots and serous retinal detachment, notably in pre-eclampsia.
Screening and follow-up
- Hypertensive retinopathy predicts stroke, heart and kidney damage; it is part of target-organ assessment.
- Retinal vein occlusion often reveals undiagnosed hypertension.
- Bilateral disc swelling with very high blood pressure is a hypertensive emergency, not papilloedema from a brain mass.
Next step / Initial management
- Mild changes: confirm and treat hypertension and assess other target organs (kidney, heart).
- Haemorrhages, cotton-wool spots or exudates: urgent blood pressure control and assessment of target-organ damage.
- Disc swelling or visual symptoms with very high pressure: hypertensive emergency; admit and lower the pressure in a controlled way, avoiding an abrupt fall.
- Retinal vein occlusion: always measure blood pressure.
Test yourself
Think of the answer, then tap the question to see it.
Which finding defines malignant hypertensive retinopathy?
Optic disc swelling, together with haemorrhages, cotton-wool spots and exudates.
How should blood pressure be lowered in a hypertensive emergency with disc swelling?
In hospital and in a controlled, gradual way, avoiding an abrupt fall that can cause ischaemia.
Which retinal event often reveals undiagnosed hypertension?
A retinal vein occlusion.
Connections
See it in 3D3
The structures of Durgical's 3D anatomy where it is found.
Educational content; not a clinical guideline and no substitute for assessment by a health professional. For sudden visual loss, severe eye pain, a chemical burn or an eye injury, go to an emergency department at once.
Sources: Hypertensive Retinopathy (StatPearls Publishing (NCBI Bookshelf), 2025); Guía de práctica clínica: hipertensión arterial primaria (Ministerio de Salud y Protección Social de Colombia, 2013).
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Representative model, for educational purposes only.