Ocular inflammation, also known as conjunctivitis or 'pink eye, ' is an infection of the eye caused by bacteria or viruses. It is characterized by redness, swelling, and discharge from the eye. The most common form of ocular inflammation is a STYE, which is an infection of the eyelid caused by bacteria. A STYE is usually painful and can cause the eyelid to become swollen and red. Treatment for ocular inflammation typically involves antibiotics or antiviral medications.