Vernal conjunctivitis is one of several diseases caused by eye allergens. It is among the more dangerous diseases caused by eye allergies because it can permanently damage vision if left untreated.

Other diseases caused by eye allergies include:

• Allergic conjunctivitis. An allergic reaction of the clear skin of the eye to an allergen such as pollen, mold or dander. It involves an inflammation of the conjunctiva (the thin, transparent membrane that covers the outer surface of the eye) and can result in itching, burning, and redness in the eye. Swollen eyelids, itching, watery eyes and clear eye discharge also are symptoms of allergic conjunctivitis. Vernal conjunctivitis is a chronic form of allergic conjunctivitis.
  

  

• Atopic keratoconjunctivitis. A type of allergic conjunctivitis that is associated with atopic dermatitis of the eyelids, body and face. Symptoms include redness, itchiness, burning, tearing, stringy or ropy discharge and swelling. Age of onset is usually teens through early 20s, and patients often have a history of allergies, especially allergic rhinitis and/or asthma. Like vernal conjunctivitis, atopic keratoconjunctivitis can permanently alter vision if left untreated.
  
  
• Giant papillary conjunctivitis. A type of conjunctivitis associated with contact lenses or other foreign bodies. This type of conjunctivitis is believed to be an allergic reaction involving proteins that stick to the surfaces of contact lenses, other prosthetic devices or surgical sutures. As the name implies, large bumps appear on the inner surface of the upper eyelids. This may also have nonallergy-related causes.