Allergic Conjunctivitis
Allergic conjunctivitis is an allergen-triggered inflammation of the eye surface that typically causes bilateral itching, watering and redness without loss of vision.
Key takeaways
- Itching is characteristic; pain, light sensitivity or reduced vision suggests another eye problem.
- Avoiding triggers, cool compresses and lubricating drops may help before medicated drops are added.
- Contact-lens wearers with a red painful eye need prompt assessment because corneal infection can look similar.
The listings below do not confirm an allergic cause; eye symptoms with warning signs need examination before treatment.
Distinguishing allergy from infection
Allergy usually affects both eyes and may accompany sneezing or a runny nose. Thick purulent discharge, eyelids stuck shut or one eye becoming affected first can suggest infection, while deep pain and photophobia raise concern for corneal or internal eye disease.
Treatment choices
Reducing allergen exposure and avoiding eye rubbing are useful foundations. Lubricants wash allergens from the surface; antihistamine or dual-action drops can control itch. Oral antihistamines may help associated nasal symptoms but can worsen dry eyes. Steroid eye drops require specialist supervision.
When to seek urgent care
Arrange urgent eye assessment for severe pain, light sensitivity, reduced or distorted vision, a chemical injury, marked swelling or a red painful eye after contact-lens use.