CRVO vs CRAO

Question 1

What is CRVO?

Answer 1

Thrombosis of central retinal vein causing venous congestion and retinal ischaemia

Risk factors
- HTN
- diabetes
- glaucoma
- hypercoagulable states

Question 2

What are the symptoms of CRVO?

Answer 2

Sudden painless loss of vision

Fundoscopy
- retinal haemorrhages
- dilated tortuous veins
- Cotton wool spots
- Macular oedema

Question 3

What is CRAO?

Answer 3

Occlusion of central retinal artery causes retinal ischaemia

Causes
- emboli
- GCA

Question 4

What are clinical features of CRAO?

Answer 4

Sudden painless unilateral vision loss

Fundoscopy
- pale retina
- cherry red spot at macula

RAPD present