(Atopic Conjunctivitis; Atopic Keratoconjunctivitis; Hay Fever Conjunctivitis; Perennial Allergic Conjunctivitis; Seasonal Allergic Conjunctivitis; Vernal Keratoconjunctivitis)
Allergic conjunctivitis is inflammation of the conjunctiva caused by an allergic reaction.
The conjunctiva (the membrane that lines the eyelid and covers the white of the eye) contains a large number of cells from the immune system (called mast cells) that release chemical substances (called mediators) in response to a variety of stimuli (such as pollens, mold spores, or dust mites). These mediators cause inflammation in the eyes, which may be brief or long-lasting. About 20% of people have some degree of allergic conjunctivitis.
Seasonal allergic conjunctivitis (hay fever conjunctivitis) and year-round or perennial allergic conjunctivitis (atopic conjunctivitis, atopic keratoconjunctivitis) are the most common types of allergic reaction in the eyes. Seasonal allergic conjunctivitis is often caused by mold spores or tree, weed, or grass pollens, leading to its typical appearance in the spring and early summer. Weed pollens are responsible for symptoms of allergic conjunctivitis in the summer and early fall. Perennial allergic conjunctivitis occurs year-round and is most often caused by dust mites, animal dander, and feathers.
Vernal keratoconjunctivitis is a more serious form of allergic conjunctivitis in which the stimulant (allergen) is not known. The condition is most common among boys, particularly those aged 5 to 20 years who also have eczema, asthma, or seasonal allergies. Vernal keratoconjunctivitis typically reappears each spring and subsides in the fall and winter. Many children outgrow the condition by early adulthood.
People with all forms of allergic conjunctivitis develop intense itching and burning in both eyes. Although symptoms usually affect the eyes equally, rarely one eye may be more affected than the other. The conjunctiva becomes red and sometimes swells, giving the surface of the eyeball a puffy appearance. The eyelids may become intensely itchy. Rubbing and scratching leads to eyelid skin redness, swelling, and a crinkly appearance.
With seasonal allergic conjunctivitis and perennial allergic conjunctivitis, there is a large amount of thin, watery discharge. At times the discharge is stringy. Vision is seldom affected. Many people have an itchy, runny nose.
With vernal keratoconjunctivitis, the eye discharge is thick, stringy, and mucuslike. Unlike other types of allergic conjunctivitis, vernal keratoconjunctivitis often affects the cornea (the clear layer in front of the iris and pupil), and painful, small, open sores (corneal ulcers) develop. These ulcers cause deep eye pain with exposure to bright light (photophobia) and sometimes lead to a permanent decrease in vision.
Allergic conjunctivitis treatment includes anti-allergy eye drops. Using tear supplements and avoiding known allergens can help reduce symptoms.
Drops that have an antihistamine, such as ketotifen, may be enough for mild cases. This drug can be bought without a prescription. If ketotifen is insufficient, prescription antihistamine eye drops such as olopatadine or mast cell stabilizers such as nedocromil may be effective. Nonsteroidal anti-inflammatory eye drops, such as ketorolac, help relieve symptoms. Corticosteroid eye drops have more potent anti-inflammatory effects. However, these eye drops should not be used for more than a few weeks without close monitoring by an ophthalmologist (a medical doctor who specializes in the evaluation and treatment [surgical and nonsurgical] of eye disorders) because they may cause increased pressure in the eyes (glaucoma), cataracts, and an increased risk of eye infections. Antihistamines taken by mouth, such as fexofenadine, cetirizine, or hydroxyzine, may also be very helpful.