Why does my eye allergy affect me only during certain seasons?

If your eye allergy-or allergic conjunctivitis-affects you only during certain seasons, then you suffer from seasonal allergic conjunctivitis. You're probably allergic to certain pollens that are prevalent only in the spring, summer, or fall. Tree and grass pollens are usually airborne in the spring and early summer, while weed pollens are typically airborne in summer and early fall.