Allergic conjunctivitis

Allergic conjunctivitis 






Allergic conjunctivitis is broadly divided into two main types based on duration, and a few special forms based on severity and associated conditions.


1. Seasonal allergic conjunctivitis (SAC)


  • Most common form.

  • Triggered by pollen during specific seasons (spring, summer, or autumn).

  • Symptoms appear at the same time each year.


2. Perennial allergic conjunctivitis (PAC)



  • Present year-round.

  • Caused by indoor allergens like dust mites, pet dander, mold.

  • Symptoms are milder but persistent.

Special / severe forms:


3. Vernal keratoconjunctivitis (VKC) 



  • Chronic, more common in children/young males, often worse in spring/summer.

4. Atopic keratoconjunctivitis (AKC) 



  • Associated with atopic dermatitis, affects adults, can cause corneal damage if untreated.

5. Giant papillary conjunctivitis (GPC) 




  • Often due to contact lens wear or ocular prostheses; caused by mechanical irritation plus allergic reaction.


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