What is a common allergic response seen in allergic conjunctivitis?

In allergic conjunctivitis, a common allergic response that occurs is the increased presence of eosinophils. Eosinophils are a type of white blood cell that play a key role in the body's immune response to allergens. During an allergic reaction, such as that seen in allergic conjunctivitis, the body releases histamines and other chemicals that lead to inflammation. This inflammation can result in the recruitment of eosinophils to the site of the allergen exposure, contributing to the symptoms like redness, tearing, and itching that characterize the condition.

While vasodilation can occur during an allergic reaction, it is not specific to allergic conjunctivitis, and it is more about the overall inflammatory response rather than the characteristic feature of this specific condition. Additionally, microbial growth is not a feature of allergic conjunctivitis, as this condition is not caused by infectious agents. Corneal abrasion, on the other hand, refers to physical damage to the cornea and does not occur specifically due to allergic responses. Thus, the increased eosinophils is the most relevant and specific response in the case of allergic conjunctivitis.