Which condition is characterized by a 'blood and thunder' fundus appearance?

• A. Central retinal venous occlusion
• B. Central retinal artery occlusion
• C. Hyphema
• D. Blepharitis

Answer: (A)

A central retinal vein occlusion produces this dramatic look because the blockage of the main retinal vein causes a sudden rise in venous pressure, leading to widespread retinal hemorrhages, venous dilation, and optic disc edema. The result is a congested, hemorrhagic fundus that appears as a network of diffuse intraretinal bleeds across the retina, giving the striking “blood and thunder” appearance.

This pattern helps separate it from other conditions. A central retinal artery occlusion typically shows a pale retina with a cherry-red fovea due to arterial ischemia. Hyphema is blood in the anterior chamber, not the fundus. Blepharitis is inflammation of the eyelid margins and does not produce the characteristic fundus changes.

Clinically, CRVO presents with sudden, painless, unilateral vision loss in patients often with vascular risk factors; exam reveals diffuse retinal hemorrhages, dilated tortuous veins, and disc edema. Management involves urgent ophthalmology evaluation and addressing retinal edema and vascular risk factors; treatment may include intravitreal anti-VEGF therapy and monitoring for ischemic complications.