Sudden eye redness accompanied by severe pain is a medical emergency that requires immediate attention. Ocupol is an antibiotic eye drop designed for bacterial infections; it will not treat and could potentially worsen other serious causes of severe pain, such as acute glaucoma, uveitis, or a corneal ulcer. You should stop using Ocupol immediately and seek an urgent evaluation from an ophthalmologist or visit the nearest emergency room. Please do not attempt to self-medicate, as prompt professional diagnosis is critical to protecting your vision.