Which factor is least likely to contribute to allergic conjunctivitis?

Sun exposure is least likely to contribute to allergic conjunctivitis because this condition primarily results from the immune system’s reaction to specific allergens that trigger an inflammatory response in the conjunctiva, the membrane covering the eye. Environmental allergens such as pollen, pet dander, and other irritants can lead to symptoms like redness, itching, and excessive tearing as the body releases histamines in response to these allergens.

While excessive sun exposure can lead to other ocular conditions, such as photokeratitis or actinic keratitis, it does not typically elicit an allergic response. Allergic conjunctivitis is directly associated with airborne allergens that the body identifies as harmful, leading to an allergic reaction, whereas sun exposure does not initiate this immune response. Understanding the triggers for allergic conjunctivitis helps in managing and mitigating its symptoms effectively.