A handshake was originally a gesture of proof — an open, empty hand extended to show that no weapon was concealed. Thousands of years later, that same hand has a full day’s work ahead of it. It grips subway poles, turns doorknobs, and presses elevator buttons, then reaches out in greeting to someone we’re glad to see. In the warmth of that exchange, things invisible to the eye pass between us as well.
May is, in many ways, a month of held hands. On Parents’ Day, we clasp the hands of our mothers and fathers. Reunions bring warm handshakes with old friends. And so, right around this time of year, one group of specialists tends to get unusually busy: ophthalmologists. In the season when hands touch most, it is not the hands that pay the price — it is the eyes. The question is why.
What Is Epidemic Keratoconjunctivitis
Epidemic keratoconjunctivitis (EKC) begins when adenovirus penetrates the conjunctiva — the reddish mucous membrane lining the inner surface of the eyelids, and the thin transparent membrane covering the white of the eye. The conjunctiva serves as the outermost barrier between the eye and the external world. Once the virus crosses that boundary, immune cells rush to the site, blood vessels dilate, and the familiar onset of redness and irritation begins. Tearing and discharge soon follow, and in more serious cases, inflammation spreads beyond the conjunctiva to involve the cornea.
The route of transmission is straightforward: rubbing your eyes after shaking hands, or sharing a towel or eye drops with someone who is infected — that is all it takes. The incubation period runs from five to fourteen days. A person may go about their daily life with no idea they are infected, while the virus is already making its way to the next host.
An Uninvited Guest in the Month of Family
Parks crowded with day-trippers, family gatherings around a shared meal, class reunions filled with handshakes and embraces. In the season when people close the distance between themselves most readily, adenovirus moves with quiet, unassuming efficiency. If your eyes turned red after pinning a carnation on your parents for Parents’ Day (a tradition observed annually on May 8 in Korea), it may not have been only flowers that were exchanged.
From the handrails of intercity bus terminals to the restroom doors of highway rest stops, the adenovirus traces its own path along the festive routes of the long holiday weekend. It spreads readily — one infected family member can be enough to carry it through an entire household, and the same holds true in schools and workplaces. The word “epidemic” in the name is not incidental.
Why the Conjunctiva Is So Vulnerable
Why the conjunctiva in particular? The skin is protected by a tough outer layer of keratinized cells that blocks most would-be intruders. The conjunctiva has no such shield. That openness is precisely what allows the eye to receive light and color with such clarity — but from a virus’s perspective, it is an unlocked door.
The eye does have its own defenses, of course. Lysozyme in tears works to break down foreign matter, and blinking washes it away. But adenovirus is far smaller than bacteria and slips through that net with ease. Its outer shell is also durable enough to survive for weeks on environmental surfaces. The eye’s natural defenses, impressive as they are, are not quite equal to this particular adversary.
Common Mistakes When Epidemic Keratoconjunctivitis Strikes
When the eyes turn red, the instinct to rinse them with saline solution is understandable. Adenovirus, however, is not so easily dislodged. Worse, the reassurance of having “washed it out” tends to make people touch their eyes more frequently — and every contact between hand and eye creates another opportunity for the virus to spread. Eye drops require the same caution. Even a legitimately prescribed eye drop, once shared within a family, can transfer the virus from one person’s eye to the next via the dropper tip. And the habit of checking one’s eyes with a finger — born of anxiety about whether the infection has taken hold — means that same hand then goes on to touch everything else. Worry, in this way, completes the chain of transmission.
Reaching for an over-the-counter redness-relief eye drop is another mistake that’s easy to make. These drops work simply by constricting blood vessels, making the eye appear whiter for a time. It is no different from covering a bruise with concealer — the underlying condition is untouched. The virus continues to progress while the person, believing themselves improved, resumes normal contact with others.
What to Do When You Have Epidemic Keratoconjunctivitis
EKC is a viral infection, which means antibiotics are ineffective. There is also, as yet, no eye drop that directly neutralizes adenovirus. Treatment, then, centers on supporting the body’s immune system long enough for it to clear the infection on its own. The physician’s role is to reduce the patient’s discomfort in the meantime.
The most fundamental measure is artificial tears, applied frequently to dilute the concentration of virus on the eye’s surface and protect the irritated conjunctiva. Cold compresses help reduce swelling and the sensation of heat — a clean gauze pad dampened with cold water and placed gently over the closed eye works well. Warm compresses should be avoided, as heat can worsen inflammation. If both eyes are affected, use separate gauze pads for each to prevent cross-contamination.
When redness and itching are severe, a visit to an ophthalmologist is warranted. Prescription eye drops aimed at managing the inflammatory process are available, and antibiotic drops may be added if a secondary bacterial infection develops. The complication most worth watching for is corneal opacity. Blurred vision or halos around lights are signs that warrant prompt evaluation.
Recovery typically takes two to three weeks. During that period, towels and toiletries should not be shared, and swimming pools and communal bathhouses should be avoided. If traveling, it is safer to use separate towels even in a hotel. It is worth knowing that even after symptoms appear to resolve, the infection can remain contagious for up to roughly two weeks from onset. Until the discharge from the eye clears entirely, close contact with others should be minimized.
Before You Extend a Welcoming Hand
Preventing epidemic keratoconjunctivitis is not complicated. Wash your hands regularly under running water, and make a conscious effort to keep your hands away from your eyes. That is the whole of it — no special medication, no expensive equipment. The simplest habit turns out to be the most reliable protection.
The history of the handshake is a history of trust. In the age when an open, empty hand meant no harm was intended, a clean hand was a clean conscience. Nothing about that has changed as we head out into the May sunshine. Before extending your hand in greeting, wash it first. If the welcome in your heart is genuine, the hand that carries it ought to be clean. May’s light is brilliant enough to make you squint. How much better to take it in with clear, untroubled eyes.
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