COVID-19 can cause a range of eye problems, from mild irritation to more serious changes in the retina. Most eye symptoms appear within the first two weeks of infection, with a typical onset around day six. They usually resolve within about 10 days, though a small percentage of people develop persistent issues that last well beyond the acute illness.
Why the Virus Affects Your Eyes
The surface of your eye is lined with the same cellular entry points that SARS-CoV-2 uses to infect the lungs. Researchers confirmed that the conjunctiva (the clear membrane covering the white of your eye), the cornea, and the limbus (the border between the cornea and the white) all carry these receptors, with especially high concentrations on the outermost layer of cells. This means the virus can directly infect ocular tissue, potentially using the eye as both a target and a gateway into the body.
There have been documented cases of healthcare workers becoming infected when their eyes were the only unprotected part of their face. Viral genetic material has also been detected in tears and conjunctival secretions, which is why eye protection became standard in clinical settings early in the pandemic.
The Most Common Eye Symptoms
Conjunctivitis, or pink eye, is the eye problem most closely linked to COVID-19. A meta-analysis of over 3,300 patients found that roughly 1% of COVID patients develop conjunctivitis, though individual studies have reported rates as high as 15.9% depending on the population studied. Conjunctivitis sometimes appears as one of the earliest signs of infection, even before respiratory symptoms emerge.
Beyond pink eye, people with COVID have reported dry eyes, burning sensations, foreign body sensation (feeling like something is stuck in your eye), blurred vision, and itchy eyes. One study found itchy eyes in about 8% of patients before diagnosis, and blurred vision became the most commonly reported eye symptom after diagnosis, affecting about 9% of patients.
Retinal Changes During Infection
COVID-19 can cause subtle but measurable changes in the blood vessels at the back of the eye. In a study published in The Lancet’s eClinicalMedicine, researchers found dilated veins in nearly 28% of COVID patients (compared to 3% in a control group), retinal hemorrhages in about 9%, cotton wool spots (small areas of damaged retinal tissue from interrupted blood flow) in 7.4%, and tortuous, abnormally twisted vessels in about 13%.
These findings reflect the broader vascular damage COVID can cause throughout the body. Most people with these retinal changes don’t notice any vision problems, and the changes are typically discovered during a dilated eye exam. However, they underscore how COVID’s effects on blood vessels extend well beyond the lungs and heart.
Eye Problems in Children With MIS-C
Children who develop Multisystem Inflammatory Syndrome (MIS-C) after a COVID infection face a notably high rate of eye involvement. In a systematic review of 895 pediatric MIS-C patients, 52.4% had eye symptoms. The hallmark is non-purulent conjunctivitis, meaning the eyes become red and inflamed but without the thick discharge typically seen in bacterial pink eye. This makes it easy to miss.
The pattern is similar to Kawasaki disease, where conjunctivitis appears in over 90% of cases. Because non-purulent conjunctivitis can be one of the first visible signs of MIS-C, recognizing it early can prompt faster treatment for the broader inflammatory condition.
Long COVID and Persistent Eye Symptoms
For some people, eye problems don’t resolve when the acute infection clears. Dry eye disease is one of the most well-documented lingering ocular effects of long COVID. Studies comparing post-COVID patients to healthy controls have found a statistically significant increase in dry eye, measured both by patient-reported symptoms and clinical testing.
The mechanism involves damage to the tiny nerve fibers on the surface of the eye. These nerves are part of the reflex that triggers tear production, so when they’re impaired, the eyes don’t stay properly lubricated. COVID also appears to inflame the meibomian glands (the oil-producing glands along your eyelid margins that keep tears from evaporating too quickly) and trigger the release of inflammatory molecules on the eye’s surface. The result is a cycle of dryness, irritation, and blurred vision that can persist for weeks or months.
Patients with these long-term symptoms often describe visual fatigue, frontal headaches during close-up work like reading or screen use, and blurred vision that persists even when their actual visual acuity tests normal. In one retrospective study, about 3.6% of patients who developed eye symptoms during COVID experienced visual disturbances that did not resolve during the follow-up period.
Rare but Serious Complications
Optic neuritis, an inflammation of the nerve that connects the eye to the brain, has been reported after COVID-19 infection. It typically causes sudden vision loss or dimming in one eye, pain with eye movement, and altered color perception. The condition is rare, and its reporting rate after COVID-related events falls within the incidence range seen in the general population. Most cases are linked to the body’s inflammatory response rather than direct viral damage to the nerve, and many patients recover significant vision with treatment.
When Eye Symptoms Typically Appear
About 73% of COVID-related eye symptoms show up within the first two weeks of illness. The median onset is around day six, with most people experiencing symptoms somewhere between day three and day ten. Once they appear, eye symptoms last a median of 10 days, with a typical range of five to 16 days.
Timing matters for context. Conjunctivitis tends to appear early and may coincide with or even precede respiratory symptoms. More serious eye involvement, such as retinal changes, is more commonly associated with severe COVID cases and may develop later in the disease course.