Allergic Conjunctivitis (Atopic Conjunctivitis; Atopic Keratoconjunctivitis; Hay Fever Conjunctivitis; Perennial Allergic Conjunctivitis; Seasonal Allergic Conjunctivitis; Vernal Keratoconjunctivitis) By Zeba A Syed, MD, Wills Eye Hospital Reviewed / Revised Apr 2023 View Patient Education Etiology Symptoms and Signs Diagnosis Treatment Key Points Topic Resources Allergic Conjunctivitis Vernal Conjunctivitis Differentiating Features... Allergic conjunctivitis is an acute, intermittent, or chronic conjunctival inflammation usually caused by airborne allergens.