What is the main presentation of allergic conjunctivitis?

The main presentation of allergic conjunctivitis typically includes clear, watery discharge and a sensation of a foreign body in the eye. This condition is characterized by an inflammatory response to allergens, such as pollen, pet dander, or dust mites, leading to symptoms that predominantly affect both eyes. Patients often report itchy, red eyes alongside these other symptoms. The clear, watery discharge is a result of the body's allergic response, which increases tear production as a way to flush out the allergen. Additionally, the foreign body sensation arises from irritation of the conjunctiva, which can feel uncomfortable or as if something is lodged in the eye.

The other options describe symptoms associated with different ocular conditions. Purulent discharge indicates a bacterial infection, typically seen in bacterial conjunctivitis, while dry eyes and irritation can be linked to environmental causes or conditions such as Sjögren's syndrome. Swelling of the eyelids and changes in vision could suggest more severe issues, including infections or inflammatory conditions, but they are not typical features of allergic conjunctivitis.