Does the coronavirus also get into the human body through the eyes? That would not be implausible because there are also mucous membranes there that can be attacked. But examinations by ophthalmologists cannot confirm this. Nevertheless, caution is advised. Sars-CoV-2 is highly infectious and is mainly transmitted through inhalation of droplets or aerosols. However, an infection via the eye was also discussed again and again. Infection via the mucous membranes, including the conjunctiva, appeared to be possible.

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At the virtual annual meeting of the German Ophthalmological Society (DOG), however, ophthalmologists came to the conclusion that Sars-CoV-2 infection via the surface of the eye is rather unlikely. The reports the “Ärztezeitung”. Accordingly, Professor Clemens Lange from the Freiburg University Medical Center referred to studies with more than 2000 Covid-19 patients, of whom only three percent had signs of conjunctivitis. In his opinion, this speaks against a relevant route of infection via the conjunctiva. In addition, the eye inflammation may also have been a result of intensive medical treatment.

Little relevant

The examinations of deceased Covid-19 sufferers would not have provided any evidence of increased conjunctivitis. In addition, no increased viral load was detected in the eyes of the dead examined in Bonn, Basel and Tübingen. Lange said at the congress: “I interpret the current study situation in such a way that the conjunctiva is a less relevant entry point and a less relevant replication site for Sars-CoV-2 compared to other tissues such as the lungs.”

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The ophthalmologists did not want to give a complete all-clear. It is still unclear whether there are molecular entry gates for the virus on the cornea and conjunctiva. In principle, it cannot be ruled out that virus-contaminated aerosols will reach the tear film of healthy people and then arrive via the draining tear ducts in the nasal mucosa and the airways in order to trigger an infection. Smear infections with the hands over the eyes also seem possible. For this reason, ophthalmologists continue to recommend wearing protective goggles that encircle the eyes when in close contact with Covid 19 patients.

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