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Allergic Conjunctivitis

IgE-mediated hypersensitivity reaction of the conjunctiva to environmental allergens (pollen, dust mites, animal dander), characterized by bilateral itching, redness, watery discharge, chemosis, and lid swelling, treated with allergen avoidance, topical antihistamines/mast cell stabilizers, and systemic antihistamines for severe cases.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

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What is Allergic Conjunctivitis?

Allergic conjunctivitis is an IgE-mediated Type I hypersensitivity reaction of the conjunctiva, with mast cell degranulation releasing histamine, tryptase, prostaglandins, and leukotrienes upon allergen re-exposure. It affects 10-30% of the population and is the most common ocular allergy. Classification includes: seasonal allergic conjunctivitis (SAC, 90% of cases, tree/grass/ragweed pollen), perennial allergic conjunctivitis (PAC, dust mites Dermatophagoides, animal dander, indoor molds), vernal keratoconjunctivitis (VKC, severe pediatric form, boys 5-20 years, hot dry climates), atopic keratoconjunctivitis (AKC, adults with atopic dermatitis, sight-threatening), and giant papillary conjunctivitis (GPC, contact lens, ocular prostheses).

Pathophysiology involves early phase (minutes, mast cell-mediated, histamine release causing itching, redness, watering) and late phase (4-8 hours, eosinophil/Th2-mediated inflammation with tissue damage). Hallmark symptom is bilateral itching (key differentiator from bacterial/viral conjunctivitis); other symptoms include conjunctival injection, watery discharge, chemosis (conjunctival edema), lid edema, and papillary reaction (cobblestone appearance under upper lid). VKC and AKC may have corneal involvement (shield ulcers, Horner-Trantas dots, limbal infiltrates).

Diagnosis is clinical based on bilateral itching, allergic history, and characteristic findings. Treatment progresses stepwise: allergen avoidance and lubrication (cool compresses, preservative-free artificial tears) → topical antihistamines/mast cell stabilizer combinations (olopatadine 0.1-0.7%, ketotifen, alcaftadine, bepotastine, BID-QID) → topical NSAIDs (ketorolac) → topical steroids (loteprednol, fluorometholone, short-term for severe exacerbations, monitor IOP and cataract) → topical cyclosporine 0.05-0.1% or tacrolimus 0.03% (VKC, AKC, steroid-sparing) → systemic antihistamines (cetirizine, loratadine, fexofenadine) → subcutaneous immunotherapy (SCIT) or sublingual immunotherapy (SLIT) for refractory cases.

Symptoms

Bilateral ocular itching (cardinal symptom)
Conjunctival injection (redness)
Watery, mucoid discharge
Chemosis (conjunctival swelling)
Lid edema, periorbital puffiness
Tearing, photophobia (mild)
Papillary reaction on upper tarsal conjunctiva
Associated allergic rhinitis, sneezing, nasal congestion

Risk Factors

Personal or family history of atopy (asthma, eczema, rhinitis)
Seasonal pollen exposure (spring, summer)
Indoor allergens: dust mites, animal dander, mold
Contact lens wear (GPC)
Atopic dermatitis (AKC)
Pediatric age, male sex (VKC)
Hot, dry climates (VKC)
High allergen burden, urban pollution

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Symptoms not responding to OTC antihistamines
  • Vision changes, photophobia, severe pain
  • Severe lid swelling, marked chemosis
  • Suspected corneal involvement (shield ulcer in VKC)
  • Recurrent or persistent symptoms despite treatment
  • Need for steroid therapy (requires monitoring)
  • Contact lens-related symptoms (rule out GPC)
  • Children with severe seasonal symptoms

Treatment Methods

01
Allergen avoidance: window closure, HEPA filters, dust mite covers
02
Cool compresses, preservative-free artificial tears
03
Dual-action: olopatadine, ketotifen, alcaftadine, bepotastine BID
04
Topical NSAID: ketorolac for itching/inflammation
05
Topical corticosteroids: loteprednol, fluorometholone (short-term)
06
Topical cyclosporine 0.05-0.1% (VKC, AKC, chronic)
07
Topical tacrolimus 0.03% (severe AKC)
08
Systemic antihistamines: cetirizine, loratadine, fexofenadine
09
Allergen immunotherapy (SCIT or SLIT) for refractory disease
10
Discontinue contact lens wear in GPC

Which Department to Visit?

You can visit our Göz Hastalıkları department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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