Coronavirus: Your eyes and COVID-19
Our eyes may play a role in the spread and prevention of the COVID-19 coronavirus pandemic, eye doctors and health experts say.
To cut your personal risk of contracting COVID-19 — including new variants of the coronavirus detected in 2020 and 2021 — avoid touching your eyes, nose and mouth with unwashed hands. It is the mucous membranes (membranes that line various cavities in the body) that are most susceptible to transmission of the virus.
And to avoid spreading the coronavirus to others (even if you have no symptoms of the disease), always follow the latest guidelines from the U.S. Centers for Disease Control and Prevention (CDC) and local health officials about social distancing and wearing a protective face mask in public.
Be aware, however, that face masks do not protect your eyes from exposure to the coronavirus.
SEE RELATED: Face masks don't protect your eyes
How is the new coronavirus related to your eyes?
The relationship between the transmission of the coronavirus (COVID-19) and your eyes is complicated.
It’s thought that coronavirus spreads from person to person mainly through airborne “respiratory droplets” produced when someone coughs or sneezes, much like the flu virus spreads, the CDC says. These droplets can land in the mouths or noses of people who are nearby, and possibly be inhaled into the lungs.
These droplets also can be spread to your eyes when you touch your face and then your eyes with unwashed hands.
Also, the possibility exists that you can contract this virus by touching a surface or object, such as a table or doorknob, that has coronavirus on it and then touching your mouth, nose or possibly your eyes.
This is why the CDC and the World Health Organization (WHO) recommend diligently washing your hands frequently during the day for 20 seconds or more with warm water and soap.
IF YOU'RE NOT FEELING WELL... Call your family doctor. If you suspect you may have an eye or vision problem that may be related to the coronavirus, call an eye doctor. Be sure to call first, as most health care and eye care offices’ policies regarding walk-in patients and in-office procedures have changed since the COVID-19 pandemic began.
Doctor believes he contracted COVID through his eyes
Peking University respiratory specialist Wang Guangfa believes he contracted COVID-19 while not wearing eye protection when he treated patients at health clinics in China. Medical officials, though, say while this is possible, it may be unlikely.
Wang reported that his left eye became inflamed afterward, followed by a fever and a buildup of mucous in his nose and throat. He subsequently tested positive for the coronavirus (COVID-19).
According to the South China Morning Post, Wang thinks the virus entered his left eye because he wasn’t wearing protective eyewear.
Dr. Jan Evans Patterson, professor of medicine and pathology in the Long School of Medicine’s infectious diseases division at UT Health San Antonio, confirms that a scenario like Wang’s could potentially happen.
In Wang’s situation, she says, respiratory droplets from an infected person might have reached his eyes or other mucous membranes.
Generally, though, transmission of the coronavirus that causes COVID-19 comes with so many unknowns that it’s “plausible but unlikely” to contract it through hand-to-eye contact, says Dr. Stephen Thomas, chief of infectious diseases at SUNY Upstate Medical University in Syracuse, New York.
Glasses may offer some protection from coronavirus transmission
The American Academy of Ophthalmology (AAO) recommends contact lens wearers switch to glasses temporarily as a way to reduce their risk of contracting COVID-19.
Contact lens wearers touch their eyes more often than people wearing glasses, the ophthalmology group says.
The American Optometric Association (AOA), though, says contact lenses are safe as long as the wearer follows directions for lens care.
Glasses and sunglasses don't offer a complete barrier from respiratory droplets sprayed toward your eyes. Safety glasses, which protect the exposed sides and the area around your eyes may offer better protection, health care experts say.
WHO specifically recommends safety glasses or face shields for anyone providing regular care for people with COVID-19.
Coronavirus and conjunctivitis
Certain eye problems have been associated with the coronavirus.
In a recent study published in BMJ Open Ophthalmology, researchers found the three most common eye symptoms experienced by people with a confirmed diagnosis of COVID-19 were:
In 80% of the participants in the study, the eye symptoms lasted less than two weeks.
All three of these eye symptoms are commonly associated with an eye condition called conjunctivitis.
Viral conjunctivitis is known to present with upper respiratory infections (colds, flus, etc.) and may be a symptom of the COVID-19 virus. A recent study of hospitals across China, published in the New England Journal of Medicine, found “conjunctival congestion” or red, infected eyes in nine of 1,099 patients (0.8%) with a confirmed diagnosis of coronavirus.
A study in The Journal of Medical Virology of 30 patients hospitalized for COVID-19 had only one patient diagnosed with conjunctivitis. Based on this information, the occurrence of conjunctivitis is low.
Furthermore, the risk of transmission of the new coronavirus through tears is low, according to a new study published in Ophthalmology. Researchers tested tear samples collected from patients with COVID-19 in Singapore.
What is coronavirus?
Reports of a new coronavirus (also referred to as COVID-19) first emerged in late December 2019 in Wuhan, China.
Coronaviruses are a group of common viruses. Some affect only animals (such as bats, cats, camels and cattle), while others also affect people, according to the U.S. National Library of Medicine.
COVID-19 can trigger ailments as minor as the common cold, or more consequential such as bronchitis, pneumonia and kidney failure. The most severe cases may be life-threatening. This is the seventh known type of coronavirus, according to CDC.
How contagious is the new coronavirus?
COVID-19 is highly contagious, but it's still unclear how it compares to the common flu in this regard.
If a person has COVID-19, they may be contagious for a longer period of time than if they had the flu, according to CDC.
Both illnesses are spread from person to person through droplets in the air from an infected person coughing, sneezing or talking. But there is a possible difference: COVID-19 might be spread through the airborne route, meaning that tiny droplets remaining in the air could cause disease in others, even after the ill person is no longer near, according to Johns Hopkins Medicine.
Coronavirus can hit anyone. Thankfully, most people recover. The actor Tom Hanks and UK Prime Minister Boris Johnson are just two well-known people who have contracted the coronavirus.
SEE RELATED: Coronavirus transmission through the eyes
What are the symptoms of COVID-19 coronavirus?
Symptoms of COVID-19 include a mild to severe respiratory illness accompanied by a fever, cough and breathing problems, according to the World Health Organization. Other symptoms include runny nose, sore throat and headache.
In the BMJ Open Ophthalmology study above, the most reported COVID-19 symptoms were:
Dry cough (66%)
Loss of smell/taste (70%)
Most people develop only mild symptoms. But some people, usually those who are older or have other medical complications, develop more severe symptoms, including pneumonia, which can be fatal.
Symptoms normally show up two to 14 days after someone has been exposed to the virus.
How is COVID-19 diagnosed?
Health care professionals diagnose the coronavirus through lab tests of respiratory or blood samples or other bodily fluids.
Is there a vaccine or treatment for the new coronavirus?
As of February 10, 2021, two COVID-19 vaccines were authorized for use in the United States, produced by the pharmaceutical companies Pfizer and Moderna. Production and distribution of these vaccines are increasing, and additional vaccines are expected to be authorized for use soon. [READ MORE about COVID-19 vaccines.]
How can you cut your risk of contracting coronavirus?
The CDC has established a site with the most up-to-date information related to the coronavirus outbreak.
The CDC's recommended steps to prevent illness include:
Clean your hands often
Wash your hands often with soap and water for at least 20 seconds, especially after you have been in a public place, eaten, used the restroom, blown your nose, coughed or sneezed.
Avoid touching your eyes, nose and mouth as much as possible, but especially with unwashed hands.
Reduce your exposure
Avoid close contact with people who are sick.
Stay home if you’re sick — except to get medical care.
Cover coughs and sneezes
Cover your mouth and nose with a tissue when you cough or sneeze or use the inside of your elbow.
Throw used tissues in the trash.
Immediately wash your hands with soap and water for at least 20 seconds after coughing or sneezing.
Wear a face mask in public that covers your mouth and nose.
Clean and disinfect surfaces
Current evidence suggests that novel coronavirus may remain viable for hours to days on surfaces made from a variety of materials, CDC reports. Cleaning of visibly dirty surfaces followed by disinfection is a best practice measure for prevention of COVID-19 and other viral respiratory illnesses in households and community settings.
At least some coronavirus can potentially remain viable — capable of infecting a person — for up to 24 hours on cardboard and up to three days on plastic and stainless steel, The Washington Post reports, citing research by a laboratory that is part of the National Institute of Allergy and Infectious Diseases.
How to dress to limit the spread of COVID-19
If you are heading out to the grocery store, walking the dog or jogging to get in some exercise, wear a cloth face mask whenever you are in a public place. It doesn't have to be fashionable, it just has to help block transmission of the virus.
This is true even if you have no symptoms of COVID-19 because it's possible to contract the virus and not yet experience any signs or symptoms of the disease.
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Page updated February 2021