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

the essential
In the United States, researchers have established a link between possible Covid-19 contamination and observed occlusions in the eye. Partial or even complete loss of vision has been observed in some contaminated patients.

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

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

An “eyeball”

These pathologies are synonymous with vascular accidents in the eyes. From what has been observed, the blood vessels of the retina are blocked by clots or fatty deposits: this is called an “ocular 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. Then therapeutic management might be possible. Many patients who have seen a partial deterioration in their vision have seen a gradual return to normal. For those who have suffered a total loss of the threshold of vision, no treatment has been developed.

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Previous studies have shown that Covid-19 is likely to infect the eyes: work carried out by researchers from the Hospital Fondation Adolphe de Rothschild noted the presence of nodules in the macula, the area of ​​the retina located at the back of the eye. This is a sign of possible direct eye damage. The researchers indicate that Covid-19 would be capable of directly infecting the eye through a protein (ACE2), necessary to allow the virus to infect an organism.

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