COVID-19 can cause dry eyes, and the link runs deeper than you might expect. A systematic review and meta-analysis of multiple studies found dry eye was the single most common ocular symptom of COVID-19, with an estimated prevalence of about 14% across all severity levels.1PubMed Central. Pooled Prevalence Estimate of Ocular Manifestations in COVID-19 Patients: A Systematic Review and Meta-Analysis The virus appears to affect the eye surface through several overlapping pathways, from direct tissue infection to nerve damage to autoimmune-like reactions, and the symptoms don’t always resolve when the respiratory illness does.
How Common Dry Eyes Are During COVID Infection
The roughly 14% prevalence estimate from pooled studies represents the average across all COVID cases, including mild ones where the eyes are barely affected. Among hospitalized patients with more severe disease, the numbers are dramatically higher. One study of 42 hospitalized COVID patients found that around 62% met the threshold for dry eye symptoms using a standard questionnaire, and about 67% qualified on a separate symptom scale.2Journal of Ophthalmology. Symptoms of Dry Eye Disease in Hospitalized Patients with Coronavirus Disease 2019 (COVID‐19) Severity matters: a study of 157 patients found that people with moderate-to-severe COVID had significantly higher dry eye symptom scores at the time of diagnosis compared to those with mild illness, with median scores roughly seven times higher.3Heliyon. Dry eye symptoms are prevalent in moderate-severe COVID-19, while SARS-COV-2 presence is higher in mild COVID-19
A large cross-sectional study of patients infected with the Omicron variant reported dry eye in about 65% of COVID patients compared with 55% of uninfected controls.4PubMed Central. Dry eye disease among patients infected with the SARS-CoV-2 Omicron variant: a cross-sectional study That gap is real but modest, which hints at something important: the pandemic itself, and not just the virus, pushed dry eye rates up across the board. Screen time, masks, indoor air, and poor sleep contributed regardless of infection status.
How the Virus Reaches the Eye Surface
SARS-CoV-2 relies on certain receptor proteins to enter human cells. The best-known is ACE2, which is expressed at low levels in conjunctival tissue. Two other receptors the virus can use, BSG and TMPRSS2, show up at intermediate levels in both the conjunctiva and the cornea.5PubMed. Ocular Surface Expression of SARS-CoV-2 Receptors These receptors are the biochemical doorways that let the virus interact with cells on the eye surface, even though the eye is not the primary site of infection.
Researchers have detected live virus in tear samples, confirming that SARS-CoV-2 does reach the ocular surface during active infection. In one study, about 7% of tear samples tested positive, and every patient with positive tears also had a positive nasopharyngeal test.6Eye. Detection of severe acute respiratory syndrome Coronavirus-2 in the tears of patients with Coronavirus disease 2019 Another study found about 11% of hospitalized patients had virus-positive tear and conjunctival samples, even when those patients had no eye symptoms at all.7PubMed Central. Detection of coronavirus in tear samples of hospitalized patients with COVID-19 The viral load in tears was consistently lower than in the nose and throat, which may explain why eye symptoms tend to be milder than respiratory ones.
Beyond the surface, the virus also appears to inflame the lacrimal glands, which produce the watery component of your tears. Research has identified SARS-CoV-2 protein in the inflammatory cells around lacrimal gland tissue, along with strong ACE2 expression in the gland itself. When the lacrimal gland becomes inflamed, tear production can drop or become chemically abnormal, setting the stage for dryness.
When Symptoms and Standard Tests Don’t Match
Here is where the picture gets interesting and a bit frustrating. Not all studies agree on what COVID does to the tear film when measured objectively, and the disconnect between how patients feel and what clinical instruments detect has been a consistent finding.
One study compared COVID patients to controls using several standard tear film measurements, including tear meniscus height, non-invasive tear breakup time, and the Schirmer test (which measures tear production with a small paper strip). None of these showed a significant difference between groups.8PubMed Central. The Ocular Surface Symptoms and Tear Film Parameters during and after COVID-19 Infection By every measure the instruments could capture, the COVID patients’ tears looked normal.
But a different cohort study found the opposite. Post-COVID patients had a meaningfully shorter tear breakup time (about 7 seconds versus 10 in controls), along with significantly worse Schirmer test results and higher tear osmolarity, all pointing to real, measurable tear film disruption.9Cornea. Ocular Surface Impairment After Coronavirus Disease 2019: A Cohort Study These patients were assessed after recovering from COVID, suggesting the damage can persist.
To complicate matters further, the study of 157 patients mentioned earlier found that dry eye complaints in mild and moderate cases did not correlate with objective measurements at all. People felt dry, but the standard tests couldn’t confirm it.10Heliyon. Dry eye symptoms are prevalent in moderate-severe COVID-19, while SARS-COV-2 presence is higher in mild COVID-19 This mismatch isn’t unique to COVID, but it suggests that the virus may be doing something to the eye that standard dry eye testing isn’t designed to detect. The corneal nerve findings described below offer one explanation.
Corneal Nerve Damage After Infection
One of the more striking discoveries has been that SARS-CoV-2 can damage the small nerve fibers in the cornea. These nerves are responsible for the blinking reflex and for signaling your tear glands to produce moisture, so when they’re injured, you may feel dryness, burning, or light sensitivity without any visible damage on a routine eye exam.
A study that used in vivo confocal microscopy, an imaging technique that can visualize individual nerve fibers in the cornea, found that over 90% of recovered COVID patients showed changes consistent with small fiber neuropathy. These changes included beaded axons (nerve fibers with irregular swelling along their length) in roughly 83% of cases and neuroma-like formations in about 65%. Eight of the patients reported increased dryness after their infection and had positive dry eye indicators. The structural nerve abnormalities were still present up to 10 months after infection.11PubMed Central. Small fiber neuropathy in the cornea of Covid-19 patients associated with the generation of ocular surface disease
A separate case report described a 27-year-old woman who developed bilateral eye pain and light sensitivity five months after COVID. Standard examination showed clear corneas with no staining, meaning no obvious surface damage. But confocal microscopy revealed microneuromas, activated inflammatory cells, and abnormal stromal keratocytes, all signs of neuropathic corneal pain.12PubMed Central. Neuropathic Corneal Pain after Coronavirus Disease 2019 (COVID-19) Infection This pattern helps explain the disconnect between symptoms and standard tests: the problem may sit in the nerves rather than in the tear film itself, and routine dry eye workups won’t catch it.
A Sjögren’s-Like Autoimmune Trigger
Some researchers have raised the possibility that SARS-CoV-2 can trigger an autoimmune response that targets the glands producing tears and saliva, mimicking aspects of Sjögren’s disease. Sjögren’s is a chronic autoimmune condition in which the immune system attacks moisture-producing glands, causing dry eyes and dry mouth.
In an animal model, mice infected with SARS-CoV-2 developed reduced saliva flow, elevated antinuclear antibodies (immune proteins that mistakenly attack the body’s own cells), and lymphocyte infiltration in the lacrimal and salivary glands. About 70% of infected mice developed antinuclear antibodies, and levels of anti-SSB/La, an autoantibody strongly associated with Sjögren’s disease, were significantly elevated compared to uninfected controls.13PubMed Central. Evidence of a Sjögren’s disease–like phenotype following COVID-19 in mice and humans
Human data from the same research group backed this up. Blood samples from COVID-19 patients showed increases in antinuclear antibodies and Sjögren’s-associated autoantibodies. Minor salivary gland biopsies from six convalescent COVID subjects showed focal lymphocyte infiltration in four, with two of the six meeting the histologic criteria for Sjögren’s disease. Even more intriguingly, some antibodies produced against the virus’s spike protein were found to cross-react with nuclear antigens, meaning the immune system’s attempt to neutralize the virus may accidentally prime it to attack the body’s own glands.14PubMed Central. Evidence of a Sjögren’s disease–like phenotype following COVID-19 in mice and humans This does not mean everyone who catches COVID will develop Sjögren’s disease, but it suggests a mechanism by which the virus could cause lingering gland dysfunction in some people.
Dry Eyes as Part of Long COVID
Dry eye complaints don’t always clear up with the acute illness. The good news from the study of 157 patients is that symptom scores dropped substantially over two weeks, reaching near-zero by day 14 for most participants.15Heliyon. Dry eye symptoms are prevalent in moderate-severe COVID-19, while SARS-COV-2 presence is higher in mild COVID-19 For the majority of people, dry eyes from COVID are temporary.
But a subset of patients reports persistent symptoms. Case reports have documented dry eye disease appearing as part of a broader long COVID syndrome alongside fatigue, sleep disturbances, and light sensitivity, with symptoms all responding simultaneously to a combined treatment regimen after about six weeks.16PubMed Central. Ocular and Neurological Sequelae in Long COVID: Dry Eye, Asthenopia, Sleep Disorders, Asthenia, and Restless Legs Syndrome-A Case Report with Literature Review The simultaneous improvement of seemingly unrelated symptoms suggested a shared underlying mechanism, likely neuroinflammation or autonomic dysfunction rather than isolated eye-surface disease.
More recently, tear fluid analysis in people with persistent ocular symptoms after COVID has revealed widespread immune dysregulation. One study using targeted tear proteomics identified 178 dysregulated proteins in symptomatic post-COVID patients, including several linked to immune signaling and peripheral neuropathy.17Nature Communications. Long-term ocular symptoms following COVID-19 linked to immune dysregulation, dysautonomia and peripheral neuropathy This kind of molecular evidence connects the subjective complaint (“my eyes feel dry”) to measurable biological changes in patients months after infection.
Mask-Associated Dry Eye and Other Pandemic Confounders
Separating what the virus does from what the pandemic did is one of the trickiest parts of interpreting the dry eye data. Face masks, which became ubiquitous during COVID waves, create their own dry eye problem. A poorly fitted mask channels exhaled air upward across the eye surface, accelerating tear evaporation. Studies confirmed that longer mask-wearing time correlated with worse dry eye scores, particularly in the three-to-six hour per day range. People who already had dry eye before the pandemic were hit hardest, with more than half reporting that their symptoms worsened during the masking period, compared to fewer than one in five among those without a prior history.18PubMed Central. Mask-Associated Dry Eye During COVID-19 Pandemic–How Face Masks Contribute to Dry Eye Disease Symptoms Nonstandard mask wearing and dry indoor environments also contributed to what became known as mask-associated dry eye.19Scientific Reports. Wearing face masks and possibility for dry eye during the COVID-19 pandemic
On top of masks, lockdowns themselves changed daily habits in ways that promote dry eye. Increased screen time, reduced time outdoors, disrupted sleep, poor nutrition, and indoor air quality changes were all identified as risk factors for what one group of researchers called “quarantine dry eye.”20PubMed Central. The “Quarantine Dry Eye”: The Lockdown for Coronavirus Disease 2019 and Its Implications for Ocular Surface Health The Omicron-era study quantified some of these: using screens for more than eight hours a day was the single biggest risk factor for dry eye symptoms in both COVID patients and controls, dwarfing the effect of the infection itself. Poor sleep quality and contact lens use were also significant in both groups.21PubMed Central. Dry eye disease among patients infected with the SARS-CoV-2 Omicron variant: a cross-sectional study
Contact Lenses as a Risk Multiplier
Contact lens wearers showed up consistently as a high-risk group during the pandemic. A meta-analysis pooling data from multiple studies found dry eye prevalence of about 84% among contact lens wearers during COVID compared to about 68% among non-wearers, though the difference did not quite reach statistical significance with an odds ratio of 1.90.22PubMed Central. Prevalence of dry eye during the COVID-19 pandemic: A systematic review and meta-analysis The Omicron study was less ambiguous: contact lens use was a powerful risk factor for dry eye symptoms in COVID patients, with a very large effect size.23PubMed Central. Dry eye disease among patients infected with the SARS-CoV-2 Omicron variant: a cross-sectional study Contact lenses already stress the ocular surface by sitting on the tear film and reducing oxygen flow to the cornea; add viral inflammation or prolonged screen use, and the combined burden pushes many wearers past the symptom threshold.
What Helps
For most people, dry eye from an acute COVID infection resolves within a couple of weeks as the body clears the virus. Preservative-free artificial tears are the first-line approach during this period. Warm compresses over the eyelids and deliberate blinking breaks during screen time also help, though these are standard dry eye advice rather than anything COVID-specific.
For persistent or more severe cases, prescription treatments may be warranted. One study evaluated a cyclosporine A eye drop, which suppresses local inflammation on the eye surface, in patients whose dry eye emerged or worsened during the pandemic. Symptom scores improved significantly within 30 days and continued improving at 90 days, with measurable improvements in redness and tear film stability.24PubMed Central. Assessment of the efficacy of 0.1% cyclosporine A cationic emulsion in the treatment of dry eye disease during COVID-19 pandemic Anti-inflammatory drops like cyclosporine make particular sense in this context, given the evidence that COVID triggers inflammatory and autoimmune processes on the ocular surface.
If you developed dry eye symptoms during or after COVID and they haven’t resolved after several weeks, it’s worth telling an eye care provider about your infection history. The neuropathic component described above won’t show up on a standard slit-lamp exam and may require confocal microscopy to detect. Knowing that the problem may involve nerve damage or autoimmune gland inflammation rather than simple tear deficiency can change which treatments your provider recommends.
The Vaccination Question for People With Existing Autoimmune Dry Eye
People living with Sjögren’s disease, which already causes significant dry eye, have understandably wondered whether COVID vaccination might trigger a flare. A cross-sectional study of 32 patients with primary Sjögren’s found that more than half reported a disease flare after the first vaccine dose, with flares declining somewhat after the second and third doses. The most common flare symptom was joint pain rather than eye dryness, though dry mouth and dry eyes were the most common baseline symptoms in the group.25International Journal of Surgery: Global Health. Does the COVID-19 vaccine cause a disease flare in patients with primary Sjögren’s syndrome? A Cross-Sectional Study This was a small, self-reported study, so the flare rate should be interpreted cautiously. Vaccination is still broadly recommended for autoimmune patients, but if you have Sjögren’s and notice worsening symptoms after a shot, the phenomenon has been documented and your rheumatologist should be aware of it.