Covid-19: blurred vision, clogged blood vessels… can the virus cause an “eye stroke”?

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In the United States, researchers have established a link between potential Covid-19 contamination and occlusions observed in the eye. A partial or even total loss of vision has been observed for some contaminated patients.

It is a virus that mutates and whose impact on our body is constantly changing. We now know the impact that contamination with Covid-19 can have on the respiratory tract or on our ENT system. Much less is known about the eyes. Scientists from the University of Michigan (USA) have looked into this question and have established a link between infection with the virus and several potentially irreversible and serious eye conditions.

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The study, published on April 14 on the scientific publications site JAMA Network, establishes a strong link between a potential contamination and what is called a central retinal artery occlusion (ROAC). The results ? Blurred vision or sudden loss of vision in one eye. The researchers showed that this pathology was more frequent, by almost 29.9%, over a period of 2 to 26 weeks after contamination. Same observation for retinal vein occlusions, the cases of which increase by 47% between 2 and 26 weeks after contamination.

An “eye stroke”

These pathologies are synonymous with vascular accidents in the eyes. From what has been observed, the blood vessels in the retina are blocked by clots or fatty deposits: this is called an “eye stroke”. This affects vision and for good reason: the retina is the part of the garlic that receives light and then transmits the images to the brain. These post-contamination occlusions can generate a partial or total loss of garlic vision.

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According to scientists, Covid-19 affects veins more than arteries. Therapeutic management could then be possible. Many patients who have seen a partial deterioration of their vision have seen a gradual return to normal. For those who have suffered a total loss of threshold vision, no treatment has been developed.

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Previous studies have shown that Covid-19 was likely to be able to infect the eyes: work carried out by researchers at the Adolphe de Rothschild Foundation Hospital has made it possible to observe the presence of nodules in the macula – the area of ​​​​the retina located at the bottom of the eye. This is a sign of potential direct eye damage. The researchers indicate that Covid-19 would be able to directly infect the eye through a protein (ACE2), necessary to allow the virus to infect an organism.



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