A red, irritated eye with mild pain can be caused by dry eyes, allergies, or a mild infection. For quick relief, you can use over-the-counter lubricating eye drops (artificial tears) to soothe irritation. If allergies are the cause, antihistamine drops like ketotifen may help. However, because you have pain, it is crucial to avoid using medicated drops, such as antibiotic drops (like ofloxacin), without a proper diagnosis. Please have a healthcare professional examine your eye to prescribe the correct treatment. Seek prompt medical care if you notice vision changes, worsening pain, or extreme sensitivity to light.