Allergic conjunctivitis affects about 15 to 25% of the population, with a higher prevalence in people with atopy (Leonardi 2012, Bielory ICON 2020). It causes intense itching, tearing, a gritty sensation and chemosis (swelling) of the conjunctiva. This very real discomfort may seem harmless, but it hides a danger: repeated eye rubbing, which I will explain to you. At the practice, I offer an accurate diagnosis and treatment tailored to the type of allergy (seasonal, perennial, or even severe pediatric forms), together with guidance to help break this vicious circle.
It is an immediate (IgE-mediated) hypersensitivity reaction: the allergen is recognized by mast cells in the conjunctiva, which degranulate and release histamine and inflammatory mediators. The hallmark symptom is itching.
Your conjunctiva is directly exposed to allergens: pollen, dust mites, animal dander, mold. Unlike the skin, it is permeable and easily reached. If you have an atopic predisposition (asthma, rhinitis, eczema), your conjunctival mast cells carry specific IgE against these allergens. With each exposure, degranulation and histamine release = intense itching, redness, tearing.
The allergic reaction appears quickly (15-20 minutes), but the inflammation lasts longer because of other mediators: tryptase, leukotrienes, prostaglandins.
Eye allergy is clearly distinct from other ocular surface conditions:
Allergy, dry eye and blepharitis often coexist (allergy + dry eye, allergy + blepharitis), which complicates the diagnosis and calls for an integrated treatment approach.
Key point: itching is the central sign of allergy. If you have intense itching together with an atopic background (asthma, eczema, rhinitis), an allergic cause is very likely.
No blood test is required for a simple eye allergy: the patient history and slit-lamp examination are usually enough. I add an allergy work-up if specific sensitizing allergens are suspected.
Seasonal or perennial? History of atopy (asthma, rhinitis, eczema)? Exposure to pollen, dust mites, animals? Family history? One eye or both? Did previous eye drops work?
Eyelids (swelling, eczema), conjunctiva (injection, chemosis), eversion of the upper eyelid to look for papillae, corneal fluorescein staining (punctate keratitis, ulcers), and screening for associated keratoconus.
Skin prick tests (pollen, dust mites, animal dander, mold) or specific serum IgE. Useful mainly in PAC or AKC, and to justify desensitization (allergen immunotherapy).
Corneal OCT or corneal topography in VKC / AKC. Screening for early signs of keratoconus. Photographs to monitor severe forms.
Early diagnosis and appropriate treatment help prevent complications. Book an appointment for a full assessment.
Book an appointment ↗During my work at the CHNO des Quinze-Vingts (Paris), I devoted a large part of my research to the still largely under-recognized link between eye allergy, itching and eye rubbing. My publications shed light on a key mechanism behind chronic disease and the risk of corneal complications.
Journal Français d'Ophtalmologie · 2023;46(2):173-184
A comprehensive review of allergic ocular itching and its link with eye rubbing: initial allergy symptoms, the urge to scratch, release of inflammatory cytokines, corneal damage and perpetuation of the itch. This review highlights a key mechanism of chronicity: treating the allergy also means protecting the cornea.
Journal of Clinical Medicine · 2023;12(4):1529
Our prospective study of allergic patients describes the behavioral and cognitive dimension of eye rubbing — an almost automatic, self-perpetuating gesture in some patients. This finding supports a stronger educational approach: stopping eye rubbing is a treatment goal in its own right, to protect the cornea in the long term.
Eye allergy management follows a step-up strategy, adapted to the severity and to the response to previous treatment.
Avoid pollen (windows closed, glasses), dust mites (hypoallergenic bedding, washing at 60 °C) and animals (keep them off the bed). Rinse the eyes with saline solution several times a day.
Azelastine (Allergodil) or levocabastine (Levophta), 1 to 2 times a day. Fast-acting (15 min), well tolerated. First-line treatment for mild to moderate allergy.
Olopatadine, ketotifen, epinastine: immediate antihistamine effect + prolonged mast cell stabilization. Useful both for prevention and during flare-ups.
Sodium cromoglycate, nedocromil. To be applied before exposure (outdoor sports, gardening during pollen season). A preventive rather than symptom-relieving action.
Cetirizine, desloratadine, bilastine — mainly useful when rhinitis is also present. Less effective for isolated eye itching.
NSAIDs (ketorolac) during inflammatory flare-ups. Corticosteroids (fluorometholone, dexamethasone) as short courses (2-4 weeks max) for severe forms. Intraocular pressure monitoring is mandatory.
Ciclosporin 0.1% (Verkazia®, approved for VKC in children aged 4 and over) or tacrolimus ointment (off-label) if previous steps have failed or the cornea is at risk. Long-term treatment, regular follow-up.
Sublingual or injectable desensitization to the identified allergen (pollen, dust mites). Lasts 3 to 5 years, with gradual improvement. Reserved for proven, identified allergies.
Essential point: Stopping eye rubbing is as important as the eye drops. Antihistamines reduce itching, which makes it easier to stop rubbing. Teaching patients not to rub their eyes is crucial.
Contact lenses are not recommended during an active allergy. They can trap allergens and worsen symptoms. If you must wear them anyway:
During a flare-up, glasses are a must.
An uncontrolled allergy complicates healing and encourages eye rubbing after surgery. Before LASIK, SMILE or an ICL, I check:
These checks allow me to approve or postpone surgery on a case-by-case basis.
Pollen varies with the season. Grasses April-June (peaks in May-June), trees February-April (birch in March), weeds August-September. A perennial allergy can overlap and mask these variations. Desensitization can significantly reduce symptoms after 1-2 years of treatment.
Absolutely, especially boys aged 5 to 15, who can develop severe forms (VKC). Early treatment is crucial to prevent corneal ulcers. Only some children have a severe allergy; others have mild allergies. An assessment at the practice helps determine the level of risk.
AIT usually lasts 3 to 5 years. Symptoms improve gradually: first improvement around 6-12 months, with the maximum effect often at 2-3 years. After stopping, tolerance generally persists for several years. It is a long-term treatment that requires commitment, but the benefits can last well beyond the end of the protocol.
They are manifestations of the same atopic predisposition. Allergic rhinitis often accompanies eye allergy. Asthma can be triggered by inhaling dust mites or pollen. In atopic patients, treating one allergy (eye, nose) often reduces symptoms in the other mucous membranes.
Rubbing releases inflammatory cytokines and can further stimulate mast cell degranulation. This creates a vicious circle: the more you rub, the more it itches. In the long term, chronic rubbing can thin the cornea (keratoconus). Our EYERUBBICS study even highlighted an addictive behavioral component of eye rubbing.
It is not recommended during an active allergic flare-up. Make-up can trap allergens and worsen symptoms. In remission, hypoallergenic make-up applied away from the immediate eyelid area may be acceptable. Ask for advice at the practice.
Yes. Chronic rubbing combined with atopy can promote progressive corneal thinning and keratoconus. This is especially true in VKC/AKC. Hence the importance of treating the allergy aggressively and teaching patients to stop rubbing their eyes. Regular corneal topography if you are at risk.
Confirmed allergy to cats/dogs: keep the animal out of the bed and bedrooms, brush it regularly outdoors, and wash your hands after contact. Some patients benefit from immunotherapy against animal dander. Sometimes, separation is unavoidable. We discuss this case by case at the practice.
Eye allergy fuels eye rubbing, which weakens the cornea and worsens dry eye. A comprehensive assessment allows me to identify your allergic background and offer treatment tailored to your profile.
Discover other ocular surface conditions and their treatments.
This page is based on international guidelines and key publications in ocular allergy. All sources can be verified.
Hage A, Knoeri J, Leveziel L, Majoulet A, Buffault J, Labbé A, Baudouin C. From ocular itching to eye rubbing: a review of the literature. J Fr Ophtalmol. 2023;46(2):173-184.
Hage A, Knoeri J, Leveziel L, Majoulet A, Buffault J, Labbé A, Baudouin C. EYERUBBICS: The Eye Rubbing Cycle Study. J Clin Med. 2023;12(4):1529.
Leonardi A, Bogacka E, Fauquert JL, et al. Ocular allergy: recognizing and diagnosing hypersensitivity disorders of the ocular surface. Allergy. 2012;67(11):1327-1337.
Bielory L, Delgado L, Katelaris CH, Leonardi A, Rosario N, Vichyanond P. ICON: Diagnosis and management of allergic conjunctivitis. Ann Allergy Asthma Immunol. 2020;124(2):118-134.
Bonini S, Sacchetti M, Mantelli F, Lambiase A. Systemic treatment of ocular allergy: a practical guide. Curr Opin Allergy Clin Immunol. 2007;7(5):436-441.
Knoeri J, Mhenni R, Friquet C, Hage A, et al. Comparison of optical aberrations in keratoconus with scleral versus rigid gas permeable lenses. Eur J Ophthalmol. 2024;34(2):394-398.
The content of this website is for information only and is not a substitute for a medical consultation. Any treatment decision should be made together with your ophthalmologist.