The itch that never goes away: allergic eyes in children

There is one question I ask before anything else when a child arrives with red eyes, and it decides most of the consultation. Does it itch? Not sting, not feel gritty, not just water. Itch. Children answer this better than adults, because a child with itchy eyes does not answer at all. They grind a knuckle into the eye while you are still telling me what has been going on.

A clear yes usually means allergy. A no usually means something else, and something else needs treating differently.

His eyes itch every single day. Is that normal?

It is common, and your child does not have to put up with it quietly. This is allergic conjunctivitis: the thin clear layer over the white of the eye reacting to something ordinary in the air. Dust, pollen, the cat, the mattress, the ceiling fan nobody has wiped since Raya. The eye is not damaged. It is inflamed, and inflamed tissue itches.

The itch is the whole diagnosis. If the eyes are not itchy, it is usually not an allergy. Around it sits the rest of the pattern: burning, watering, redness, puffy lids, and lid edges that look thickened and sore. Some children get tiny bumps on the surface that a parent will never see but I can, and a severely affected child flinches from bright light. It rarely comes alone either. Children with asthma or eczema are more likely to get allergic eye disease, which is why I ask about the chest and the skin before the eyes.

Parents often ask whether we should test for the exact allergen. Usually no. The common triggers are so common that a test rarely changes anything, and the treatment is the same either way.

Is it an infection? Do I keep her home from school?

It is not an infection, it is not contagious, and she does not need to stay home for it. That is the part that reassures parents most, because allergic eyes look exactly like the sakit mata going around the kindergarten, red and wet and unhappy, and the whole family is braced for it to spread. It will not.

Two things separate them. Allergy itches, and it usually takes both eyes at once. Infective pink eye more often starts in one eye, arrives with a cold, and brings discharge rather than itch. A third look-alike sends a lot of children to me: hard blinking and squeezing, which can be allergy but can equally be a tic or a dry eye, and the three are told apart by different things.

How do I get him to stop rubbing?

By making the eye less itchy. Not by telling him, and not by pulling his hand away, which every parent has tried and which works for about four seconds. Rubbing here is not a habit. It is a response, and it is the engine of the whole problem: rubbing releases more of the chemical that causes the itch, so the eye itches more, so he rubs more. That loop is what turns a mild allergy into three weeks of misery.

The things that break the loop are unglamorous and they work. A cool compress on closed lids. Plain lubricating drops, which rinse the allergen off the surface, and which are noticeably better kept in the fridge. Wash his face and hair after outdoor play, so what settled on him during football does not come to bed with him. Wash pillowcases often, vacuum the bedroom carpet, and send him out in sunglasses or his ordinary spectacles, which keep a surprising amount out. Rubbing has other causes too, and one long-term reason to take it seriously: years of hard rubbing is linked with a thinning cornea in the teenage years. Linked, not proven to cause, but enough that I never dismiss a child who rubs hard every day.

The pharmacy gave us antihistamine drops. What do they actually do?

They interrupt the itch at the eye itself, which is why drops usually beat a tablet for a child whose only symptom is eyes. They act where the problem is, and they do not make a child drowsy in the middle of a school week.

There are broadly three levels, and it helps to know which you were handed. The most useful class both blocks histamine and steadies the cells that release it, so it treats today's itch and prevents next week's, taken twice a day through the season rather than only on bad days. An older class does the same preventive work less strongly and needs four doses a day, a real disadvantage at school. Below both sit plain lubricating drops, used up to four times a day, which will not treat a moderate allergy but add real relief to a mild one. If the nose runs too, an oral antihistamine or a nasal spray treats both at once.

I am deliberately not naming a product for you to buy at the counter. Which class suits your child depends on their age, what else they take, and how long the season runs, and that is a conversation for the pharmacist or the doctor seeing them. What I will say is this: a prescribed drop should not run on month after month without anyone reviewing it. If you are still buying refills three months later, that is the moment to be seen again, not the moment to buy a fourth bottle.

Are steroid eye drops safe for a child?

Only with an eye doctor watching, and I mean that literally rather than as a formality. Steroid drops are genuinely useful at the severe end of allergic eye disease, and they are also the drops that cause glaucoma, cataract and corneal infection when used too freely or for too long. Glaucoma damages the nerve silently, and a child will not tell you it is happening.

So the rule is simple. Steroid drops are prescribed by an ophthalmologist and monitored by one. The leftover bottle from last year's flare-up is not a head start on this year's, and neither is a bottle prescribed for an older sibling. If a course was started for your child, the review appointment attached to it is part of the treatment, not an optional extra.

The doctor said vernal. What does that mean?

Vernal keratoconjunctivitis is the serious end of the same condition, and being told your child has it is a reason to stay with a specialist rather than a reason to panic. It is more common in boys, seen more often in hot dry climates than cool ones, and it usually keeps company with asthma or eczema. Under the upper lid, where nobody can see without flipping it, the surface grows large bumps called papillae. That is often the finding that names it.

What makes it different is that it can involve the cornea, the clear window at the front of the eye, and the cornea is the part that affects sight. That is why vernal disease is managed differently: not because the itching is worse, though it usually is, but because it is now happening on something that matters. Treatment can involve an allergy drop and a steroid drop together, and sometimes a medicine that damps down the immune response in the eye directly. The good news, and I tell every family this at the first visit, is that most children grow out of it in their teenage years.

When is it more than an itch?

When it stops being an itch. Pain instead of itch, marked redness, light that actively hurts, or any suggestion the cornea is involved: those get a phone call and an urgent appointment, not a wait-and-see. Redness, light sensitivity, a change in vision and pain are the four signs I would never ignore in a child's eye. Any one earns an appointment, and two together should be seen faster. Our urgent-symptoms guide sorts each sign into today, this week or routine.

There is a quieter threshold too, and parents rarely feel entitled to use it. A month of treatment with no improvement is a reason to be referred. A known vernal or atopic flare-up that has not improved after two weeks of treatment is a reason to be seen urgently. You do not need pain to justify going back. Not getting better is enough.

Most children with allergic eyes do not lose vision, and most find it eases as they grow. In between, it can still ruin a term. A child who is not sleeping, cannot read the whiteboard through watering eyes, or is being told off for rubbing is not managing well, whatever the eye looks like from outside. Say that out loud at the appointment. It changes what we prescribe. And if dark smudges have appeared under the eyes alongside all this, those shadows come from the same place.

Common questions

References

1. AAPOS · Allergic conjunctivitis · aapos.org
2. Moorfields Eye Hospital · Children's eye conditions management, allergic eye disease (seasonal, perennial, vernal, atopic) · www.moorfields.nhs.uk
3. American Academy of Ophthalmology · Pink eye (conjunctivitis) · www.aao.org
4. American Academy of Ophthalmology · Child eye problems parents should never ignore · www.aao.org
5. American Academy of Ophthalmology · What is keratoconus · www.aao.org
6. NHS · Conjunctivitis · www.nhs.uk

By Dr Chan Li Yen. General information only. It does not replace a consultation. If you are worried about your child's eyes or vision, please see an eye doctor.